arch/posix: Workaround race condition in glibc #96780
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Explicitly link with libgcc_s to work around a race condition in glibc when dynamically loading libgcc_s in multiple threads.
The race condition was observed in the past in #87987 (comment) when running native_sim with
CONFIG_REBOOT=yandCONFIG_NATIVE_SIM_REBOOT=yand rebooting quicklyfrom
main(). As well as in the newboards.native_sim.reset_hw_infotest that was temporarily disabled in #96765.Most likely, this is caused by
pthread_exit()andvprintfloadinglibgcc_sin two threads at the same time. The program then crashes withWith this PR, no crashes were observed for the following example (without sleeping) based on #87987 (comment):