[Qt-creator] Change MSVC compatibility for clang-cl

[Julius Bullinger]

Hi,

is there a way to change the MSVC compatibility/ABI 
(``-fms-compatibility``, see 
https://clang.llvm.org/docs/MSVCCompatibility.html) for detected 
clang-compilers in Creator?

clang-cl is autodetected as "MSVC2017" compatible and vcvarsall.bat from 
VS2017 is called. But we change the compatibilty in our .pro file to 
MSVC2013, so the wrong system headers are included.

For manually added clang (without -cl), the ABI can be set, but that is 
not possible for clang-cl.

If not, should I file a feature request in JIRA?

Thanks and best regards,
Julius