Fix rpath of workflow_objc on macOS

Author: bdash

plugins/workflow_objc/build.rs

@@ -5,11 +5,21 @@ fn main() {
     println!("cargo::rustc-link-lib=dylib=binaryninjacore");
     println!("cargo::rustc-link-search={}", link_path.to_str().unwrap());
 
-    #[cfg(not(target_os = "windows"))]
+    #[cfg(target_os = "linux")]
     {
         println!(
             "cargo::rustc-link-arg=-Wl,-rpath,{0},-L{0}",
             link_path.to_string_lossy()
         );
     }
+
+    #[cfg(target_os = "macos")]
+    {
+        let crate_name = std::env::var("CARGO_PKG_NAME").expect("CARGO_PKG_NAME not set");
+        let lib_name = crate_name.replace('-', "_");
+        println!(
+            "cargo::rustc-link-arg=-Wl,-install_name,@rpath/lib{}.dylib",
+            lib_name
+        );
+    }
 }