msvc: get UnitTests compiling

Choose it from VS or pass /p:RunUnitTests=true to msbuild

Source/Core/Common/CommonFuncs.h

@@ -161,6 +161,12 @@ extern "C"
 	__declspec(dllimport) void __stdcall DebugBreak(void);
 }
 	#define Crash() {DebugBreak();}
+
+	#if (_MSC_VER > 1800)
+	#error alignof compat can be removed
+	#else
+	#define alignof(x) __alignof(x)
+	#endif
 #endif // WIN32 ndef
 
 // Generic function to get last error message.