use rt_sigprocmask, not legacy sigprocmask, syscall in pthread exit code
use rt_sigprocmask, not legacy sigprocmask, syscall in pthread exit code

chardi/musl,rofl0r/musl-old,rofl0r/musl-old,chardi/musl,chneukirchen/musl-chris2,davidlazar/musl,chardi/musl,chneukirchen/musl-chris2,davidlazar/musl