Remove linking and exporting threads

[mini-1235]

Testing to remove the patch here, this seems to cause a conflict with backward_ros

[mini-1235]

I believe the patch is unnecessary here, but when I tried to build rcutils locally, I am seeing:

Starting >>> rcutils

--- stderr: rcutils

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_dlclose@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_current_sigrtmax_private@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `_dl_make_stack_executable@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_dlclose@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_thread_freeres@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_dlclose@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_current_sigrtmax_private@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_current_sigrtmax_private@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__nanosleep_nocancel@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `_dl_make_stack_executable@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_siglongjmp@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `_dl_make_stack_executable@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_dlclose@GLIBC_PRIVATE/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld'

: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_dlclose@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_pthread_init@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_thread_freeres@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: : /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `: undefined reference to `__libc_current_sigrtmax_private@GLIBC_PRIVATE__libc_current_sigrtmax_private@GLIBC_PRIVATE'

'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_allocate_rtsig_private@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__nanosleep_nocancel@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: : /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `: undefined reference to `_dl_make_stack_executable@GLIBC_PRIVATE_dl_make_stack_executable@GLIBC_PRIVATE'

'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_thread_freeres@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_dlclose@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `__libc_siglongjmp@GLIBC_PRIVATE'

/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/ld: : /home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0/home/mini1235/pixi_repro_ws/.pixi/envs/default/bin/../x86_64-conda-linux-gnu/sysroot/lib64/libpthread.so.0: undefined reference to `: undefined reference to

I had to install c-compiler and cxx-compiler to fix the error above

pixi add c-compiler
pixi add cxx-compiler

so I am not entirely sure whether this PR is correct

cc @traversaro

[mini-1235]

Closing as the changes are not necessary here