metacity 2.24.13: fix crash on startup

Metacity crashes without the schemas installed, so RDEPEND on them

root@beaglebone:~# metacity

(metacity:594): GLib-GIO-ERROR **: Settings schema 'org.gnome.desktop.wm.preferences' is not installed

Trace/breakpoint trap
6 XSELINUXs still allocated at reset
SCREEN: 0 objects of 180 bytes = 0 total bytes 0 private allocs
COLORMAP: 0 objects of 4 bytes = 0 total bytes 0 private allocs
DEVICE: 0 objects of 64 bytes = 0 total bytes 0 private allocs
CLIENT: 0 objects of 84 bytes = 0 total bytes 0 private allocs
WINDOW: 0 objects of 20 bytes = 0 total bytes 0 private allocs
PIXMAP: 2 objects of 8 bytes = 16 total bytes 0 private allocs
GC: 4 objects of 8 bytes = 32 total bytes 0 private allocs
CURSOR: 0 objects of 4 bytes = 0 total bytes 0 private allocs
DBE_WINDOW: 0 objects of 12 bytes = 0 total bytes 0 private allocs
TOTAL: 6 objects, 48 bytes, 0 allocs
2 PIXMAPs still all[  281.248271] tilcdc 4830e000.fb: timeout waiting for framedone
ocated at reset
PIXMAP: 2 objects of 8 bytes = 16 total bytes 0 private allocs
GC: 4 objects of 8 bytes = 32 total bytes 0 private allocs
CURSOR: 0 objects of 4 bytes = 0 total bytes 0 private allocs
DBE_WINDOW: 0 objects of 12 bytes = 0 total bytes 0 private allocs
TOTAL: 6 objects, 48 bytes, 0 allocs
4 GCs still allocated at reset
GC: 4 objects of 8 bytes = 32 total bytes 0 private allocs
CURSOR: 0 objects of 4 bytes = 0 total bytes 0 private allocs
DBE_WINDOW: 0 objects of 12 bytes = 0 total bytes 0 private allocs
TOTAL: 4 objects, 32 bytes, 0 allocs
root@beaglebone:~#

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>