Make use of deleted members in Q_DISABLE_COPY

Might help the compiler to produce better error message.

Change-Id: I1df3c32084b9ecda0b2a140776ad5f57adfb2e6e
Reviewed-by: Thiago
Reviewed-on: http://codereview.qt.nokia.com/1177
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Denis Dzyubenko <denis.dzyubenko@nokia.com>

src/corelib/global/qglobal.h

@@ -2407,9 +2407,15 @@ Q_CORE_EXPORT QString qtTrId(const char *id, int n = -1);
    classes contains a private copy constructor and assignment
    operator to disable copying (the compiler gives an error message).
 */
+#ifdef Q_COMPILER_DEFAULT_DELETE_MEMBERS
+#define Q_DISABLE_COPY(Class) \
+    Class(const Class &) = delete;\
+    Class &operator=(const Class &) = delete;
+#else
 #define Q_DISABLE_COPY(Class) \
     Class(const Class &); \
     Class &operator=(const Class &);
+#endif
 
 class QByteArray;
 Q_CORE_EXPORT QByteArray qgetenv(const char *varName);