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/forward_declaration.rs

@@ -0,0 +1,21 @@
+#[repr(C)]
+struct TypeInfo {
+    data: TypeData,
+}
+
+#[repr(C)]
+enum TypeData {
+    Primitive,
+    Struct(StructInfo),
+}
+
+#[repr(C)]
+struct StructInfo {
+    fields: *const *const TypeInfo, // requires forward declaration
+    num_fields: usize,
+}
+
+#[no_mangle]
+pub extern "C" fn root(
+    x: TypeInfo,
+) {}