hypha: move libraries to libs/

libs/loopdev/Cargo.toml

@@ -0,0 +1,20 @@
+# This package is from https://github.com/stratis-storage/loopdev-3
+# Mycelium maintains an in-tree version because the goals of hypha mean that
+# there is as little binding generation as possible, especially bindings which
+# prevent development from macOS, like the original library.
+[package]
+name = "loopdev"
+version.workspace = true
+license = "MIT"
+edition = "2021"
+
+[lib]
+name = "loopdev"
+
+[dependencies]
+errno = { workspace = true }
+libc = { workspace = true }
+
+[dependencies.nix]
+workspace = true
+features = ["ioctl"]