This patch is originally by Mike Ireton <linuxhacker@yahoo.com>.
It's purpose is to allow pppd to be called with a special syspath
argument. I'll document what I mean by that and what it is useful for
on http://www.bewley.net/linux/ a little bit later.

Once you apply this patch an added argument of -S <file/path> will be
accepted and this argument will be passed on the command line to pppd
like so: 'syspath file/path'. If your pppd is not patched to handle syspath
then it will puke. If it is patched then it will use this syspath dir to
find all its configuration info rather than being stuck looking in /etc/ppp
for everything like chap-secrets, options, etc.