Add a build.rs to link bindings against the impl version

Author: elmarco

build.rs

@@ -0,0 +1,14 @@
+use std::env;
+
+fn main() {
+    if cfg!(feature = "bindings") {
+        // assuming target dir isn't tweaked
+        let manifest_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
+        let profile = env::var("PROFILE").unwrap();
+        println!(
+            "cargo:rustc-link-search=native={}/target/{}",
+            manifest_dir, profile
+        );
+        println!("cargo:rustc-link-lib=dylib=gobject_example");
+    }
+}