fix: don't add duplicate HEADER_SEARCH_PATHS

Author: rigor789

lib/pbxProject.js

@@ -1566,7 +1566,11 @@ pbxProject.prototype.addToHeaderSearchPaths = function(file, productName) {
             buildSettings['HEADER_SEARCH_PATHS'] = [INHERITED];
         }
 
-        buildSettings['HEADER_SEARCH_PATHS'].push(searchPathForFile(file, this));
+        // Check if the search path is already in the HEADER_SEARCH_PATHS and add it if it's not.
+        const searchPath = searchPathForFile(file, this);
+        if (buildSettings['HEADER_SEARCH_PATHS'].indexOf(searchPath) < 0) {
+            buildSettings['HEADER_SEARCH_PATHS'].push(searchPath);
+        }
     }
 }