Fix broken max macro on Windows (#9273)

src/google/protobuf/arena.h

@@ -37,9 +37,6 @@
 #include <limits>
 #include <type_traits>
 #include <utility>
-#ifdef max
-#undef max  // Visual Studio defines this macro
-#endif
 #if defined(_MSC_VER) && !defined(_LIBCPP_STD_VER) && !_HAS_EXCEPTIONS
 // Work around bugs in MSVC <typeinfo> header when _HAS_EXCEPTIONS=0.
 #include <exception>

src/google/protobuf/stubs/stl_util.h

@@ -37,6 +37,8 @@
 
 #include <algorithm>
 
+#include <google/protobuf/port_def.inc>
+
 namespace google {
 namespace protobuf {
 
@@ -82,4 +84,6 @@ inline char* string_as_array(std::string* str) {
 }  // namespace protobuf
 }  // namespace google
 
+#include <google/protobuf/port_undef.inc>
+
 #endif  // GOOGLE_PROTOBUF_STUBS_STL_UTIL_H__