SVN: Ignore patch related files, so they can't be accidentally committed.

Ignore `*.rej`, `*.orig`, `*.patch`, and `*.diff` files in all directories.

Fixes #38727.


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git-svn-id: https://core.svn.wordpress.org/trunk@39300 1a063a9b-81f0-0310-95a4-ce76da25c4cd