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Bug 13403 introduced support for the non-POSIX variants of these APIs found on a system called "DG/UX". Meanwhile, the complicated checks here are breaking cross-builds on systems that we actually care about. Remove the complicated checks and replace them with AC_CHECK_FUNCS. Remove the resulting dead code from a couple of .c files. https://bugzilla.gnome.org/show_bug.cgi?id=756475
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