Stop using GG_ prefixed macros (#8539)

* Stop using GG_ prefixed macros

GG_ULONGLONG was renamed to PROTOBUF_ULONGLONG some time ago

* Better

src/google/protobuf/compiler/cpp/cpp_helpers.cc

diff --git a/src/google/protobuf/compiler/cpp/cpp_helpers.cc b/src/google/protobuf/compiler/cpp/cpp_helpers.cc
index fbca72c..78c3b60 100644
--- a/src/google/protobuf/compiler/cpp/cpp_helpers.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_helpers.cc
@@ -662,14 +662,7 @@
 }
 
 std::string DefaultValue(const FieldDescriptor* field) {
-  switch (field->cpp_type()) {
-    case FieldDescriptor::CPPTYPE_INT64:
-      return Int64ToString("GG", field->default_value_int64());
-    case FieldDescriptor::CPPTYPE_UINT64:
-      return UInt64ToString("GG", field->default_value_uint64());
-    default:
-      return DefaultValue(Options(), field);
-  }
+  return DefaultValue(Options(), field);
 }
 
 std::string DefaultValue(const Options& options, const FieldDescriptor* field) {