ranged_attk() - there can be only one

Relocate the newer code for the function to mdlib.c
where makedefs can still use it.

src/mondata.c

@@ -302,18 +302,6 @@ can_blnd(
     return TRUE;
 }
 
-/* returns True if monster can attack at range */
-boolean
-ranged_attk(struct permonst* ptr)
-{
-    int i;
-
-    for (i = 0; i < NATTK; i++)
-        if (DISTANCE_ATTK_TYPE(ptr->mattk[i].aatyp))
-            return TRUE;
-    return FALSE;
-}
-
 /* True if specific monster is especially affected by silver weapons */
 boolean
 mon_hates_silver(struct monst *mon)