Patch Cargo.toml to avoid loopdev FTBFS

Otherwise a user building test from source on f38 or rawhide will
encounter a failure. This is a temporary measure and will be removed with
upcoming release of loopdev.

Signed-off-by: mulhern <amulhern@redhat.com>

Author: mulkieran

Cargo.toml

@@ -44,3 +44,8 @@ path = "./devicemapper-rs-sys"
 
 [build-dependencies]
 semver = "1.0.0"
+
+# FIXME: remove when loopdev dependency lower bound is increased from 0.4.0
+[patch.crates-io.loopdev]
+git = "https://github.com/mulkieran/loopdev"
+branch = "bump-bindgen-reduce-version"