fix support of clang-15

[efferre79]

The previous patch I submitted is creating problems with clang-15 as the option --no-default-config is available from clang-16 only. Now is also possible to detect clang version which can be useful in the future.

[efferre79]

CI on Linux is failing because the clang version is not canonical, is there installed clang from a live commit?

it is possible to support that case too (i.e. version string with commit hash string) by setting a large version number (e.g. 9999) and assuming the installed clang is taken from github and so newer than all the possible released versions to the users