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/constant_constexpr.both.compat.c

@@ -0,0 +1,19 @@
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#define CONSTANT_I64 216
+
+#define CONSTANT_FLOAT32 312.292
+
+#define DELIMITER ':'
+
+#define LEFTCURLY '{'
+
+typedef struct Foo {
+  int32_t x;
+} Foo;
+#define Foo_CONSTANT_I64_BODY 216
+
+#define SomeFoo (Foo){ .x = 99 }