fix- gcc/clang err, missed include.

Author: neeraj31285

CxxTestRegistration/src/TestMirrorProvider.cpp

@@ -20,6 +20,7 @@
 TestUtils, provides the interface to test/compare reflected type objects with actual objects (created via strict typing)
 without exposing the actual type objects to "CxxReflectionTests" project.*/
 #include "Reflect.hpp"
+#include "CxxMirror.hpp"
 #include "CxxMirror.h"
 
 #include "TestUtilsBook.h"