CXXFeatures: log check outputs to CMake(Output|Error).log
CXXFeatures: check for /Qstd=c++11 only with Intel on Windows

The WIN32 condition is true for GNU compilers built for MinGW so
narrow the condition to work only for the Intel compiler.
Merge topic 'cxx11' into next

51ce1ae CXXFeatures: check for /Qstd=c++11 only with Intel on Windows
cabd6f8 CXXFeatures: log check outputs to CMake(Output|Error).log