thread_pthread.c (native_sleep): reduce ppoll sleeps

By holding into sigwait_fd until after we acquire GVL, we can
hit the faster native_cond_sleep path instead of ppoll when
another thread wants to start sleeping.  ppoll-ing on sigwait_fd
isn't really useful in program where GVL is contended

This also allows reducing vm->gvl.lock mutex contention on
waitpid sleep migrations.

                         r64170        this patch
vm_thread_condvar1        0.921        1.356

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64193 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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