Don't mark gdk_pixbuf_error_quark() as const, to be consistent with all

Don't mark gdk_pixbuf_error_quark() as const, to be consistent with all

2004-11-23  Matthias Clasen  <mclasen@redhat.com>

	* gdk-pixbuf-core.h: Don't mark gdk_pixbuf_error_quark() as const,
	to be consistent with all the other error_quark functions.
	(technically they are const, but since these are called only
	in error paths, giving the compiler better optimization
	opportunities doesn't matter much)

	* gdk-pixbuf.symbols: Add attribute annotations.
	* makegdkpixbufalias.pl: Keep attribute annotations, but strip PRIVATE.
	* Makefile.am (gdk_pixbuf.def): Strip attribute annotations, but keep
	PRIVATE.