link now explicitely libGX11TTF with FreeType's libttf.a. Now there is

no need anymore to distribute FreeType includes and library. The only thing
the user needs to do to use TTF fonts is to get the set of font files.


git-svn-id: http://root.cern.ch/svn/root/trunk@110 27541ba8-7e3a-0410-8455-c3a389f83636