truss and procfs

[Eirik Nygaard]

truss(1) always looks for procfs in /proc, it also bails out with some not
very informative error messages if procfs is not mounted.
http://eirikn.kerneled.com/dragonfly/truss-procfs.diff checks where procfs
is mounted and if it is not present truss now tells the user what is
wrong.

-- 
Eirik Nygaard
eirikn at xxxxxxxxxxxx
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