message: Allow non-Darwin SDKs in SwiftASTContext.
diff: @@ -2148,8 +2148,9 @@ static bool SDKSupportsSwift(const FileSpec &sdk_path, SDKType desired_type) {
  }
  }
  + // For non-Darwin SDKs assume Swift is supported
  if (sdk_type == SDKType::unknown)
  - return false;
  + return true;
  } else {
  if (sdk_name.startswith(sdk_strings[(int)desired_type])) {
  version_part =
  