[lldb][test] TestInlineNamespaceAlias.py: skip on older compiler versions

This was failing with versions of clang that didn't support the
dsymutil (D143458) and llvm (D143397) changes that are needed for this test.

Remove unused parameters that we tried passing for the `dwarf` variant, which
is an NFC change. LLDB doesn't yet support `-gdwarf-5` debugging yet so
passing it to the `Makefile` would actually cause the test to fail.