Workaround for GCC12 bug illustrated by https://godbolt.org/z/Pe5aE59xG

Fixes #4108

PiperOrigin-RevId: 499556061
Change-Id: I1cb1564f9b77e1825fddc9236965f4a3b661d96a

googletest/src/gtest.cc

@@ -4888,7 +4888,8 @@ std::string StreamingListener::UrlEncode(const char* str) {
       case '=':
       case '&':
       case '\n':
-        result.append("%" + String::FormatByte(static_cast<unsigned char>(ch)));
+        result.push_back('%');
+        result.append(String::FormatByte(static_cast<unsigned char>(ch)));
         break;
       default:
         result.push_back(ch);