kib 30e6670850 In the stdio cleanup push and pop wrappers, always call libc stubs for
__pthread_cleanup_push/pop_imp instead of symbols also exported from
libthr.

This prevents calls into libthr if libthr is not yet initialized.  The
situation occurs e.g. when an LD_PRELOADed object is not linked
against libthr, but the main binary is.

Reported and tested by:	jbeich
PR:	 220381
Discussed with:	vangyzen
Sponsored by:	The FreeBSD Foundation
MFC after:	13 days
2017-06-30 20:27:51 +00:00
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