qcompilerdetection.h: add MSVC 2012 features

These are taken from the table at
  http://blogs.msdn.com/b/vcblog/archive/2011/09/12/10209291.aspx

Change-Id: Ifd2f88ca5d92092a6a025bef3da36fde0a802a66
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>

src/corelib/global/qcompilerdetection.h

@@ -657,6 +657,13 @@
 //  MSVC has std::initilizer_list, but does not support the braces initialization
 //#      define Q_COMPILER_INITIALIZER_LISTS
 #    endif
+#    if _MSC_VER >= 1700
+       /* C++11 features supported in VC11 = VC2012: */
+#      define Q_COMPILER_EXPLICIT_OVERRIDES
+#      define Q_COMPILER_RANGE_FOR
+#      define Q_COMPILER_CLASS_ENUM
+#      define Q_COMPILER_ATOMICS
+#    endif /* VC 11 */
 #endif /* Q_CC_MSVC */
 
 #ifdef __cplusplus