Linux: rseq registration tests

These tests validate that rseq is registered from various execution
contexts (main thread, destructor, other threads, other threads created
from destructor, forked process (without exec), pthread_atfork handlers,
pthread setspecific destructors, signal handlers, atexit handlers).

tst-rseq.c only links against libc.so, testing registration of rseq in
a non-multithreaded environment.

tst-rseq-nptl.c also links against libpthread.so, testing registration
of rseq in a multithreaded environment.

See the Linux kernel selftests for extensive rseq stress-tests.

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