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/thiserror/tests/ui/duplicate-enum-source.rs

@@ -0,0 +1,13 @@
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum ErrorEnum {
+    Confusing {
+        #[source]
+        a: std::io::Error,
+        #[source]
+        b: anyhow::Error,
+    },
+}
+
+fn main() {}