Fix building of the C++11 config.test on Windows with ICL

The Intel compiler does support C++11 options on the command-line.
configure.exe will correctly try to run it, but the test would fail for
incorrect reasons.

First, we need to pass the option -Qstd=c++11 to enable it.

Second, on Windows, the GCC experimental define isn't defined, nor is
__cplusplus updated yet. So we have to rely on the Intel-specific macro.

Third, we need CONFIG += console so that the application succeeds in
linking against a main() function, as opposed to a WinMain one.

Change-Id: I8f3252189df4f8854a9d9aa2cd919c288d2df420
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

config.tests/common/c++11/c++11.cpp

@@ -39,10 +39,10 @@
 **
 ****************************************************************************/
 
-#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
+#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__) || defined(__INTEL_CXX11_MODE__)
 // Compiler claims to support C++11, trust it
 #else
-#  error "__cplusplus must be >= 201103L, or __GXX_EXPERIMENTAL_CXX0X__ must be defined"
+#  error "__cplusplus must be >= 201103L, or one of __GXX_EXPERIMENTAL_CXX0X__ or __INTEL_CXX11_MODE__ must be defined"
 #endif
 
 #include <utility>

config.tests/common/c++11/c++11.pro

@@ -1,3 +1,3 @@
 SOURCES = c++11.cpp
-CONFIG += c++11
+CONFIG += c++11 console
 CONFIG -= qt

mkspecs/win32-icc/qmake.conf

@@ -39,6 +39,7 @@ QMAKE_CXXFLAGS_RTTI_ON  = -GR
 QMAKE_CXXFLAGS_RTTI_OFF =
 QMAKE_CXXFLAGS_EXCEPTIONS_ON = -GX
 QMAKE_CXXFLAGS_EXCEPTIONS_OFF =
+QMAKE_CXXFLAGS_CXX11    = -Qstd=c++11
 
 QMAKE_INCDIR            =