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.cpp

@@ -0,0 +1,29 @@
+#include <cstdarg>
+#include <cstdint>
+#include <cstdlib>
+#include <ostream>
+#include <new>
+
+extern "C" {
+
+/// 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();
+
+} // extern "C"