Revert r359717, "Make check-clang depend on the clang-check binary always"

The Tooling tests do have a lit.local.cfg with

    if not config.root.clang_staticanalyzer:
        config.unsupported = True

so what's wrong isn't the missing dep, but that lit prints a warning for
the binary missing. This will need a different kind of fix.

llvm-svn: 359739