glib: add internal g_uint_hash()/g_uint_equal()

We have g_int_hash()/g_int_equal(), which in practice might also work
with with pointers to unsigned integers. However, according to strict
interpretation of C, I think it is not valid to conflate the two.

Even if it were valid in all cases that we want to support, we should
still have separate g_uint_{hash,equal} functions (e.g. by just #define
them to their underlying g_int_{hash,equal} implementations).

Add instead internal hash/equal functions for guint.

glib/glib-private.h

@@ -303,4 +303,7 @@ GLibPrivateVTable *glib__private__ (void);
 # define GLIB_DEFAULT_LOCALE ""
 #endif
 
+gboolean g_uint_equal (gconstpointer v1, gconstpointer v2);
+guint g_uint_hash (gconstpointer v);
+
 #endif /* __GLIB_PRIVATE_H__ */