[Qt module] Privates headers: Added failing test case

Meson doesn't provides yet a convenient way to include private Qt headers

Signed-off-by: Alexis Jeandet <alexis.jeandet@member.fsf.org>

test cases/frameworks/4 qt/main.cpp

@@ -1,5 +1,11 @@
 #include <QApplication>
 #include "mainWindow.h"
+// include some random private headers
+#if QT_VERSION < 0x050000
+    #include <private/qconfig_p.h>
+#else
+    #include <private/qmetaobject_p.h>
+#endif
 
 int main(int argc, char **argv) {
   #ifndef UNITY_BUILD