RPM build fix (reverted CI changes which will need to be un-reverted or made conditional) and vendor Rust dependencies to make builds much faster in any CI system.

zeroidc/vendor/web-sys/webidls/enabled/XMLSerializer.webidl

@@ -0,0 +1,24 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://domparsing.spec.whatwg.org/#the-xmlserializer-interface
+ */
+
+// invalid widl
+// interface OutputStream;
+
+[Constructor]
+interface XMLSerializer {
+  /**
+   * The subtree rooted by the specified element is serialized to
+   * a string.
+   *
+   * @param root The root of the subtree to be serialized. This could
+   *             be any node, including a Document.
+   * @returns The serialized subtree in the form of a Unicode string
+   */
+  [Throws]
+  DOMString serializeToString(Node root);
+};