[clang] [Driver] -fno-plt: warn for unsupported targets (PR #124081)

[Martin Storsjö via cfe-commits]

https://github.com/mstorsjo approved this pull request.

LGTM, thanks! This seems to nicely fix the issue and make the situation clearer.

CC @Martchus.

https://github.com/llvm/llvm-project/pull/124081