nautilus: Add gdk-pixbuf gtk+ to DEPENDS

Fixes

| eel-accessibility.c:26:21: fatal error: gtk/gtk.h: No such file or directory
| compilation terminated.
| make[2]: *** [eel-accessibility.lo] Error 1
| make[2]: *** Waiting for unfinished jobs....
| In file included from eel-background.c:26:0:
| eel-background.h:43:21: fatal error: gdk/gdk.h: No such file or directory
| compilation terminated.
| make[2]: *** [eel-background.lo] Error 1
| eel-canvas.c:69:28: fatal error: gdk/gdkprivate.h: No such file or directory

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>