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/documentation.compat.c

@@ -0,0 +1,34 @@
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+/**
+ * The root of all evil.
+ *
+ * But at least it contains some more documentation as someone would expect
+ * from a simple test case like this.
+ *
+ * # Hint
+ *
+ * Always ensure that everything is properly documented, even if you feel lazy.
+ * **Sometimes** it is also helpful to include some markdown formatting.
+ *
+ * ////////////////////////////////////////////////////////////////////////////
+ *
+ * Attention:
+ *
+ *    Rust is going to trim all leading `/` symbols. If you want to use them as a
+ *    marker you need to add at least a single whitespace inbetween the tripple
+ *    slash doc-comment marker and the rest.
+ *
+ */
+void root(void);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif // __cplusplus