- Improve configuration of the AFS support, giving the possibility to pass
  explicitely the include and lib directories and to force static or shared
  linking. Improve also checks for the required symbols.
- Pass the full AFS configuration options to XROOTD.


git-svn-id: http://root.cern.ch/svn/root/trunk@28814 27541ba8-7e3a-0410-8455-c3a389f83636