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.cpp

@@ -0,0 +1,21 @@
+#include <cstdarg>
+#include <cstdint>
+#include <cstdlib>
+#include <ostream>
+#include <new>
+
+constexpr static const int64_t CONSTANT_I64 = 216;
+
+constexpr static const float CONSTANT_FLOAT32 = 312.292;
+
+constexpr static const uint32_t DELIMITER = ':';
+
+constexpr static const uint32_t LEFTCURLY = '{';
+
+struct Foo {
+  int32_t x;
+  static const int64_t CONSTANT_I64_BODY;
+};
+constexpr inline const int64_t Foo::CONSTANT_I64_BODY = 216;
+
+static const Foo SomeFoo = Foo{ /* .x = */ 99 };