[MERGE #1404 @digitalinfinity] Fix build break in VS2013

Merge pull request #1404 from digitalinfinity:warning_fix

Disable a warning in VS2013 in Utf8Codex.cpp (it's disabled through the rest of the project anyway, but Codex doesn't use the header that disables those warnings so explicitly disable for Utf8Codex too)

Author: digitalinfinity

lib/Common/Codex/Utf8Codex.cpp

@@ -9,6 +9,16 @@
 #define _Analysis_assume_(expr)
 #endif
 
+#ifdef _MSC_VER
+//=============================
+// Disabled Warnings
+//=============================
+
+#pragma warning(push)
+
+#pragma warning(disable: 4127)  // constant expression for template parameter
+#endif
+
 extern void CodexAssert(bool condition);
 
 namespace utf8
@@ -611,3 +621,7 @@ namespace utf8
     }
 
 } // namespace utf8
+
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif