[BUGFIX] Skip dependency check for extensions

If an incompatible extension is trying to be installed, a popup opens
with the possibility to skip dependency checks and retry the
installation. Currently the skipping is only implemented for system
checks (TYPO3 and PHP versions). This patch adds the missing skip method
during extension dependency resolving.

Resolves: #67863
Releases: master
Change-Id: Idbd4bc649a83a8e8a98652ffb8bd8081a7c65192
Reviewed-on: http://review.typo3.org/40775


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Florian Weiss <typo3org@leblanc.at>
Tested-by: Florian Weiss <typo3org@leblanc.at>
Tested-by: Markus Klein <markus.klein@typo3.org>