build_script_invocation.py: don't pass cmark args

Author: MaxDesiatov

utils/swift_build_support/swift_build_support/build_script_invocation.py

@@ -255,7 +255,6 @@ def convert_to_impl_arguments(self):
         # if we are going to build them and install_all is set, we also install
         # them.
         conditional_subproject_configs = [
-            (args.build_cmark, "cmark"),
             (args.build_llvm, "llvm"),
             (args.build_swift, "swift"),
             (args.build_foundation, "foundation"),