While XCode5's xcode-select supports the -p and --print-path options, XCode4
officially only knows -print-path. XCode4 seems to tolerate --print-path though
(tested on XCode4.6), so this can be universally used.
Patch-by: Thorsten Wagner <thorsten.wagner.4@gmail.com>
Review-by: Herbert Duerr <hdu@apache.org>