Get VS 2015 to use const int definitions

third_party/protobuf/src/google/protobuf/wire_format_lite.cc

Index: third_party/protobuf/src/google/protobuf/wire_format_lite.cc
diff --git a/third_party/protobuf/src/google/protobuf/wire_format_lite.cc b/third_party/protobuf/src/google/protobuf/wire_format_lite.cc
index 6c21478caed0e2e94c66e03b80437d667d0e9ae7..e67c6b7ab7910f4ca5d74d6b5334861b3d83c4ff 100644
--- a/third_party/protobuf/src/google/protobuf/wire_format_lite.cc
+++ b/third_party/protobuf/src/google/protobuf/wire_format_lite.cc
@@ -47,8 +47,9 @@ namespace google {
 namespace protobuf {
 namespace internal {
 
-#ifndef _MSC_VER    // MSVC doesn't like definitions of inline constants, GCC
-                    // requires them.
+#if !defined(_MSC_VER) || _MSC_VER >= 1900
+// Old version of MSVC doesn't like definitions of inline constants, GCC
+// requires them.
 const int WireFormatLite::kMessageSetItemStartTag;
 const int WireFormatLite::kMessageSetItemEndTag;
 const int WireFormatLite::kMessageSetTypeIdTag;