Revert use of the system_header GCC pragma
This reverts commit 662bf991. It is not a straight up revert because the old commit involved various long since removed ChangeLog files and we'd end up mudding the patch. The system_header GCC pragma is breaking warnings in the various g_return_* macros; GCC stopped warning when using a macro with a return value in a function that returns void, as well as when using a macro with no return value in a function that has a non-void return value. Suppressing this kind of warnings is not a good idea. Other compilers are unaffected, even ones like Clang with a GCC compatibility layer. Given the fact that the original commit was added 14 years ago as a workaround in the old days of GTK+ 1.2, I think it's safe to drop it. https://bugzilla.gnome.org/show_bug.cgi?id=753310
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