CXXFeatures: update list of expected features

Also fix a warning about an unreferenced variable in the testcase program.
CXXFeatures: add flags used by Intel compiler on Windows
CXXFeatures: wrap test-and-set for compiler flag in function
Merge topic 'cxx11' into next

3085efc CXXFeatures: wrap test-and-set for compiler flag in function
e030537 CXXFeatures: add flags used by Intel compiler on Windows
96250fd CXXFeatures: update list of expected features
Check*CompilerFlag: make C and CXX modules share most error patterns

This simplifies maintenance as most patterns will be for both modules and may
be added at a central place.
Merge topic 'cxx-flags' into next

f009129 Check*CompilerFlag: make C and CXX modules share most error patterns
remove inclusion from current dir, doesn't work for included files
Merge topic 'cxx-flags' into next

a7f3675 remove inclusion from current dir, doesn't work for included files