Bug 737255 - don't mess with localedir

According to  Pacho Ramos https://bugzilla.gnome.org/show_bug.cgi?id=737255
[warningectomy] Remove unused variable
[warningectomy] No previous prototype (missing static)

../../lib/prop_pixbuf.c:200:1: warning: no previous prototype for '_make_pixbuf_type_name' [-Wmissing-prototypes]
 _make_pixbuf_type_name (const char *p)
 ^