Breaking: #111146 - Require PHP extension fileinfo 

See forge#111146

Description 

The PHP extension fileinfo is required by the Composer package typo3/cms-core and by the Install Tool. Before, both only suggested it, although the File Abstraction Layer detects the MIME type of files with it, and the check that the MIME type of a written file matches its file extension relies on that detection.

Impact 

Composer refuses to install TYPO3 into a PHP environment without the extension fileinfo . The installation process, the Install Tool "Environment Status" and the reports module report the extension as missing instead of suggesting it.

Affected installations 

Installations whose PHP lacks the extension fileinfo . PHP enables it by default, it is only missing where PHP was built with --disable-fileinfo.

Migration 

Provide the extension in the PHP environment.