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/cbindgen/tests/rust/export_name.rs

@@ -0,0 +1,4 @@
+#[export_name = "do_the_thing_with_export_name"]
+pub extern "C" fn do_the_thing() {
+  println!("doing the thing!");
+}