Changes include an extended usage message and support for e.g. "fsxs --cflags"
style calls to get one or more defined variables on one line (instead of the
"show" command; easier for scripting).
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@7247 d0543943-73ff-0310-b7d9-9358b9ac24b2
