directiontables.cpp: fix a warning reported by VS2017

nerzhul · nerzhul · commit f36e32317502 · 2017-10-17T22:29:15.000+02:00
diff --git a/src/util/directiontables.cpp b/src/util/directiontables.cpp
@@ -110,7 +110,7 @@ const v3s16 g_27dirs[27] =
 	v3s16(0,0,0),
 };
 
-constexpr u8 wallmounted_to_facedir[6] = {
+constexpr const u8 wallmounted_to_facedir[6] = {
 	20,
 	0,
 	16 + 1,
