removed unused var 64-bit cast point to const data Made const-correct.

removed unused var 64-bit cast point to const data Made const-correct.

        * gdk/gdkfont.c: removed unused var
        * gdk/gdkim.c: 64-bit cast
        * gtk/gtkaccelgroup.c: point to const data
        * gtk/gtkdnd.[ch]: (gtk_drag_dest_set, gtk_drag_source_set):
          Made const-correct.
        * gtk/gtkfontsel.c: kill uninitialized var warning
        * gtk/gtkselection.[ch]: (gtk_target_list_new,
          gtk_target_list_add_table, gtk_selection_add_targets):
          Made const-correct.
        * gtk/testgtk.c: 64-bit cast