build_script_invocation.py: avoid invalid --skip-test-cmark

Author: MaxDesiatov

utils/swift_build_support/swift_build_support/build_script_invocation.py

@@ -295,7 +295,6 @@ def convert_to_impl_arguments(self):
             impl_args += ["--skip-test-swift"]
         if not args.test:
             impl_args += [
-                "--skip-test-cmark",
                 "--skip-test-lldb",
                 "--skip-test-llbuild",
                 "--skip-test-xctest",