CI: Removed ref to old Xcode developer dir

Author: snej

.github/workflows/build.yml

@@ -6,8 +6,8 @@ on:
   pull_request:
     branches: [ main ]
 
-env:
-  DEVELOPER_DIR: /Applications/Xcode_15.0.app/Contents/Developer
+#env:
+#  DEVELOPER_DIR: /Applications/Xcode_15.0.app/Contents/Developer
 
 jobs:
   build: