Patch by David Alan Gilbert.

        * gdk/gdkcursor.h: Add a GDK_BLANK_CURSOR cursor type.

        * gdk/x11/gdkcursor-x11.c: Cache font cursors and named cursors.

        * gdk/x11/gdkprivate-x11.h:
        * gdk/x11/gdkcdisplay-x11.c: Remove cached cursors when a
        display if finalized.


svn path=/trunk/; revision=22145