2004-11-04  Michael Natterer  <mitch@gimp.org>

	* libgimp/gimpunitcache.h
	* libgimpbase/gimpchecks.h
	* libgimpbase/gimpdatafiles.h
	* libgimpbase/gimplimits.h
	* libgimpbase/gimpmemsize.h
	* libgimpbase/gimputils.h
	* libgimpbase/gimpwin32-io.h
	* libgimpthumb/gimpthumb-enums.h
	* libgimpthumb/gimpthumb-error.h
	* libgimpwidgets/gimppreviewarea.h: added G_BEGIN_DECLS / G_END_DECLS.