[Bug libstdc++/24013] [3.4,4.0,4,1 regression] #define _POSIX_C_SOURCE breaks #include

[gerald at pfeifer dot com]

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                 CC|                            |rittle at latour dot rsch
                   |                            |dot comm dot mot dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24013