compilation fix access protected member of parent class for older GCC (#3216)

Author: sbera87

crt/aws-crt-cpp

@@ -94,6 +94,8 @@ namespace Aws
         };
 
         class AWS_CORE_API JsonErrorMarshallerQueryCompatible : public JsonErrorMarshaller {
+          using AWSErrorMarshaller::Marshall;
+
          public:
           /**
            * Converts an exceptionName and message into an Error object, if it