Update wordpress
Update wordpress

Changes:

- https://github.com/docker-library/wordpress/commit/0e92d89: Merge pull request https://github.com/docker-library/wordpress/pull/590 from infosiftr/function_exists
- https://github.com/docker-library/wordpress/commit/5f1aba1: Remove more stuff that shouldn't exist
- https://github.com/docker-library/wordpress/commit/e646d85: Remove accidental directories 😇

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