don't add duplicate rpath

fix-rpaths.py

@@ -25,9 +25,22 @@ for binary, dependencies in dependency_map.items():
 
     is_framework = '.framework' in binary
     if binary == app_binary:
-        print('\tAdding rpath: @loader_path/../Frameworks')
-        if not dry_run:
-            print('\t' + subprocess.check_output(['install_name_tool', '-add_rpath', '@loader_path/../Frameworks', binary], text=True))
+        # check if a new rpath is needed
+        new_rpath = '@loader_path/../Frameworks'
+
+        has_rpath = False
+        lines = reversed(subprocess.check_output(["otool", "-l", binary], text=True).splitlines())
+        for line in lines:
+            if line.strip().startswith('path '):
+                existing_rpath = line.strip()[len('path '):line.strip().find('(') - 1]
+                if existing_rpath == new_rpath:
+                    has_rpath = True
+            else:
+                break
+        if not has_rpath:
+            print('\tAdding rpath: ' + new_rpath)
+            if not dry_run:
+                print('\t' + subprocess.check_output(['install_name_tool', '-add_rpath', new_rpath, binary], text=True))
     for dependency in dependencies:
         end_index = dependency.index('(')
         dep = dependency[0:end_index].strip()