V10 [PATCH] sysconf: Add _SC_MINSIGSTKSZ/_SC_SIGSTKSZ [BZ #20305]

[Florian Weimer]

* Carlos O'Donell via Libc-alpha:

> We document _SC_SIGSTKSZ_SOURCE as the way to request this change.

I have previously objected to _SC_SIGSTKSZ_SOURCE.  I still it's wrong.
We haven't done anything like that in a long time.  All other recent
features have been enabled by _GNU_SOURCE, even world-breaking ones,
like the math TS macros and functions.

Thanks,
Florian
-- 
Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn,
Commercial register: Amtsgericht Muenchen, HRB 153243,
Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael O'Neill