Breaking: #68178 - Drop $GLOBALS['TYPO3_CONF_VARS']['SYS']['form_enctype'] 

See forge#68178

Description 

Setting $GLOBALS['TYPO3_CONF_VARS']['SYS']['form_enctype'] has been dropped without replacement.

Impact 

Extensions that used this setting in forms may end up with an empty enctype attribute in HTML form fields.

Affected Installations 

Extensions that rely on this variable being set.

Migration 

Substitute the variable access with multipart/form-data.