Circumvent a warning due to _POSIX_C_SOURCE being defined twice.
Circumvent a warning due to _POSIX_C_SOURCE being defined twice.

The solution is ugly but fixes the warning for now...

gregier/libpeas,gregier/libpeas,chergert/libpeas,GNOME/libpeas,gregier/libpeas,Distrotech/libpeas,chergert/libpeas,gregier/libpeas,Distrotech/libpeas,chergert/libpeas,GNOME/libpeas,Distrotech/libpeas