directiontables.cpp: fix a warning reported by VS2017

diff --git a/src/util/directiontables.cpp b/src/util/directiontables.cpp
index d700355bc0e0c5fa86da702e585c59805a513d02..b4d3eef2386432c7d47f0ac05974cba2cb7cb53c 100644 (file)
--- 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,