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/expectations/struct_self.both.c

@@ -0,0 +1,15 @@
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+typedef struct Foo_Bar {
+  const int32_t *something;
+} Foo_Bar;
+
+typedef struct Bar {
+  int32_t something;
+  struct Foo_Bar subexpressions;
+} Bar;
+
+void root(struct Bar b);