Avoid if() auto-dereference of quoted argument
Avoid if() auto-dereference of quoted argument

When testing CMAKE_CXX_COMPILER_ID, do not explicitly dereference
the variable.  Instead let if() do it in an unquoted argument.

This avoids CMP0054 warnings on MSVC.

CastXML/CastXML,thewtex/CastXML,ellert/CastXML,iMichka/CastXML,bradking/CastXML,thewtex/CastXML,bradking/CastXML,iMichka/CastXML,bradking/CastXML,thewtex/CastXML,ellert/CastXML,CastXML/CastXML,ellert/CastXML,CastXML/CastXML