[BUGFIX] Enable XClassing of t3lib_install by replacing new

This Fix Replaces 3 occurences of new t3lib_install with
t3lib_div::makeInstance('t3lib_install')

Change-Id: I59c3366de1d7326c8da899d7f48a6125149c6b1f
Fixes: #35272
Releases: 6.0, 4.7, 4.6, 4.5
Reviewed-on: http://review.typo3.org/9896
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer