Mark internal-only function as having internal linkage.

PiperOrigin-RevId: 457550818
Change-Id: I9046801b64ce4581d742d650451332fd56489632

googlemock/src/gmock-spec-builders.cc

@@ -435,7 +435,7 @@ bool UntypedFunctionMockerBase::VerifyAndClearExpectationsLocked()
   return expectations_met;
 }
 
-CallReaction intToCallReaction(int mock_behavior) {
+static CallReaction intToCallReaction(int mock_behavior) {
   if (mock_behavior >= kAllow && mock_behavior <= kFail) {
     return static_cast<internal::CallReaction>(mock_behavior);
   }