Remove stray "static"

This is a globally-visible function, so it shouldn't be marked as
static.

src/u_init.c

@@ -1367,7 +1367,7 @@ ini_inv(const struct trobj *trop)
 
    this function can be run multiple times and will overwrite the effects of
    previous runs */
-staticfn void
+void
 u_init_inventory_attrs(void)
 {
     gl.lastinvnr = 51;