[FEATURE] Allow specifying a CURL_IPRESOLVE variant for cURL requests.

[r0bin]

This allows specifying an IP resolve method for cURL requests in GeneralUtility::getUrl.

That change can prevent weird issues with certain SSL/TLS certificates where this function fails although when specifying the correct CURL_IPRESOLVE type, it does indeed work.

This should also be - and also can - backported to the TYPO3 v6.2 branch.

[TYPO3IncTeam]

Thank you for your contribution to TYPO3. We are using Gerrit Code Review for our contributions and took the liberty to convert your pull request to a review in our review system.
You can find your patch at: https://review.typo3.org/57292
For further information on how to contribute have a look at https://docs.typo3.org/typo3cms/ContributionWorkflowGuide/