* gtk/Makefile.am: build with GTK_DISABLE_DEPRECATED.
* gtk/gtkclist.c
* gtk/gtkcombo.c
* gtk/gtkctree.c
* gtk/gtklist.c
* gtk/gtklistitem.c
* gtk/gtkoldeditable.c
* gtk/gtkpixmap.c
* gtk/gtktext.c
* gtk/gtktipsquery.c
* gtk/gtktree.c
* gtk/gtktreeitem.c: whenever we #undef GTK_DISABLE_DEPRECATED and
actually use deprecated symbols (not just types or macros),
#define it again before #include "gtkalias.h" so the symbols match
and the beast links.