Konstantin Belousov 81b3a0a341 libc: implement rtld_get_stack_prot() for real
which makes stack prot correct for non-main threads created by binaries
with statically linked libthr.

Cache result, but do not engage into the full double-checked locking,
since calculation of the return value is idempotent.

PR:	252549
Reported and reviewed by:	emaste
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D28075
2021-01-10 08:25:43 +02:00
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