macos: Fix gdk_quartz_drag_context_get_dragging_info_libgtk_only symbol export
The header got included without config.h being included first which resulted in the wrong _GDK_EXTERN macro being used. As a result some symbols weren't exported and starting a DnD action would crash in the linker. This patch adds config.h includes in all places where clang complained about _GDK_EXTERN redefinitions. See #32 for more info.
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