GDK: Prefix key names with KEY_
The keysyms create a lot of potential namespace conflicts for C, and are especially problematic for introspection, where we take constants into the namespace, so GDK_Display conflicts with GdkDisplay. For C application compatiblity, add gdkkeysyms-compat.h which uses the old names. Just one user in GTK+ continues to use gdkkeysyms-compat.h, which is the gtkimcontextsimple.c, since porting that requires porting more custom Perl code.
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