Dropping constexpr ctor for DynamicMessageGlobalsInternalType.

It's not necessary and requires C++20 only features.

PiperOrigin-RevId: 899218370

Author: protobuf-github-bot

src/google/protobuf/dynamic_message.cc

@@ -368,9 +368,8 @@ using internal::MessageGlobalsBase;
 
 struct DynamicMessageGlobalsInternalType : MessageGlobalsBase {
 #ifdef PROTOBUF_MESSAGE_GLOBALS
-  explicit constexpr DynamicMessageGlobalsInternalType(
-      internal::ClassDataFull class_data)
-      : MessageGlobalsBase(class_data) {}
+  explicit DynamicMessageGlobalsInternalType(internal::ClassDataFull data)
+      : MessageGlobalsBase(data) {}
 #endif  // PROTOBUF_MESSAGE_GLOBALS
   union {
     alignas(internal::kMaxMessageAlignment) DynamicMessage _default;  // NOLINT