[clang] [clang][scan-build] Treat --use-cc and --use-c++ as shell commands (PR #131932)

[Balázs Benics via cfe-commits]

https://github.com/balazs-benics-sonarsource approved this pull request.

Thanks for the context. It looks good to me now.
@haoNoQ, maybe you know some Perl, could you have a second opinion?

Otherwise, let's merge this in a week.

https://github.com/llvm/llvm-project/pull/131932