Check out textinput from ROOT before building anything (i.e. during the Makefile-update-phase).

We pick the one corresponding to the current cling: same protocol, same branch / tag etc.
SVN-ignore the checked-out textinput.


git-svn-id: http://root.cern.ch/svn/root/trunk@41434 27541ba8-7e3a-0410-8455-c3a389f83636