Auto merge of #14551 - upsuper:legacy-gitignore, r=emilio
Auto merge of #14551 - upsuper:legacy-gitignore, r=emilio

Remove legacy items from .gitignore

The gitignore items being removed were added in f403129 for temporary files generated by `make` for cocoa integration. However, cocoa integration was later moved into its own repo [servo/cocoa-rs](https://github.com/servo/cocoa-rs), and thus the items are no longer necessary.

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