Fix string concatenation in WebEngine on Windows

MSVC thinks the firs part of that string is wide while the second
part is narrow and it won't allow to concetanete them directly.
Adding literal for wide string before ".qml" on Windows will
resolve it.

Change-Id: I934fed6fe9e9401461a8165a524e8110cec3c3fa
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

src/webengine/ui_delegates_manager.cpp

@@ -58,9 +58,15 @@
 //#define UI_DELEGATES_DEBUG
 
 #define NO_SEPARATOR
+#if defined(Q_OS_WIN)
+#define FILE_NAME_CASE_STATEMENT(TYPE, COMPONENT) \
+    case UIDelegatesManager::TYPE:\
+        return QStringLiteral(#TYPE L ##".qml");
+#else
 #define FILE_NAME_CASE_STATEMENT(TYPE, COMPONENT) \
     case UIDelegatesManager::TYPE:\
         return QStringLiteral(#TYPE".qml");
+#endif
 
 static QString fileNameForComponent(UIDelegatesManager::ComponentType type)
 {