[TASK] Include Pear/HTTP_Request2 via composer

The interface for the Pear Package HTTP_Request2
is now migrated to a composer package which resides
inside typo3/contrib/vendor and loads all files of that
package via the composer class loader.

Resolves: #65955
Releases: master
Change-Id: I14b0356601795b2bc198d011c81a67b3d5578c20
Reviewed-on: http://review.typo3.org/38071


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>