Add a patch from the isdn mailinglist, Juha writes:
Add a patch from the isdn mailinglist, Juha writes:

 ppp in 4.x apparently does a close(2) after opening the tun device;
 i4brunppp starts up with only file descriptors 0 and 1 open (to the rbch
 device) -> tun gets opened as 2 -> tun gets closed -> later use results
 in EBADF. A quick fix to i4brunppp.c makes the thing work (I know, this
 is ugly, but I needed it up quick...):

Submitted by:	Juha-Matti Liukkonen <jml@cubical.fi>

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