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/simplify_option_ptr.both.compat.c

@@ -0,0 +1,37 @@
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+typedef struct Opaque Opaque;
+
+typedef struct Option_____Opaque Option_____Opaque;
+
+typedef struct Foo {
+  const struct Opaque *x;
+  struct Opaque *y;
+  void (*z)(void);
+  void (**zz)(void);
+} Foo;
+
+typedef union Bar {
+  const struct Opaque *x;
+  struct Opaque *y;
+  void (*z)(void);
+  void (**zz)(void);
+} Bar;
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+void root(const struct Opaque *a,
+          struct Opaque *b,
+          struct Foo c,
+          union Bar d,
+          struct Option_____Opaque *e,
+          void (*f)(const struct Opaque*));
+
+#ifdef __cplusplus
+} // extern "C"
+#endif // __cplusplus