Remove checks for safe mode and magic quotes

Both are removed from 5.4.0

Safe Mode: http://php.net/manual/en/features.safe-mode.php
> This feature has been DEPRECATED as of PHP 5.3.0 and REMOVED as of PHP 5.4.0.

Magic Quotes: http://php.net/manual/en/security.magicquotes.php
> This feature has been DEPRECATED as of PHP 5.3.0 and REMOVED as of PHP 5.4.0.
Merge pull request #12646 from owncloud/remove-safe-magic-quotes

Remove checks for safe mode and magic quotes