William Hubbs f4e2142089 Add _POSIX_C_SOURCE definition to Linux build
We need this to allow builds on uclibc-ng based systems.

X-Gentoo-Bug: 650908
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=650908
2018-05-01 13:29:13 -05:00
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