Set _POSIX_C_SOURCE
to 200112L. We need it for C99 compat.
#1094
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It is invalid to compile an XPG3, XPG4, XPG4v2, or XPG5 application
using c99. The same is true for POSIX.1-1990, POSIX.2-1992, POSIX.1b,
and POSIX.1c applications. Likewise, it is invalid to compile an XPG6
or a POSIX.1-2001 application with anything other than a c99 or later
compiler. Therefore, Solaris libc forces an error in both cases.
This change is