rust/clib: build both cdylib and staticlib

For applications wishing to embed libnmstate without having to
distribute all its dependencies, it is useful to build the static
library alongside the dynamic one.

Signed-off-by: Antoni Segura Puimedon <antoni@redhat.com>

rust/src/clib/Cargo.toml

@@ -9,7 +9,7 @@ edition = "2018"
 [lib]
 name = "nmstate"
 path = "lib.rs"
-crate-type = ["cdylib"]
+crate-type = ["cdylib", "staticlib"]
 
 [dependencies]
 nmstate = { path = "../lib" }