Update php
Update php

Changes:

- https://github.com/docker-library/php/commit/7fd718d: Merge pull request https://github.com/docker-library/php/pull/918 from infosiftr/error-over-warn
- https://github.com/docker-library/php/commit/9bcb75e: Prevent "silent" failures by having docker-php-ext-configure error on unknown flags so users have to fix them

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