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/rust/constant_constexpr.rs

@@ -0,0 +1,14 @@
+pub const CONSTANT_I64: i64 = 216;
+pub const CONSTANT_FLOAT32: f32 = 312.292;
+pub const DELIMITER: char = ':';
+pub const LEFTCURLY: char = '{';
+#[repr(C)]
+struct Foo {
+    x: i32,
+}
+
+pub const SomeFoo: Foo = Foo { x: 99, };
+
+impl Foo {
+    pub const CONSTANT_I64_BODY: i64 = 216;
+}