Update Lua BitOp's stdint.h check for MSVC

based on 3ece3a3e3a

lib/bitop/bit.cpp

@@ -37,8 +37,8 @@ extern "C" {
 #include "lauxlib.h"
 }
 
-#ifdef _MSC_VER
-/* MSVC is stuck in the last century and doesn't have C99's stdint.h. */
+#if defined(_MSC_VER) && (_MSC_VER < 1700)
+/* Old MSVC is stuck in the last century and doesn't have C99's stdint.h. */
 typedef __int32 int32_t;
 typedef unsigned __int32 uint32_t;
 typedef unsigned __int64 uint64_t;