mupdate exits with signal 11

[Derrick J Brashear]

If anyone else wants to try this (I'd guess auth_unix use in mupdate isn't 
common?)
http://www.contrib.andrew.cmu.edu/~shadow/auth_unix.c.diff
is a diff which probably works. I'm still unsure if there are platforms 
using the 3 argument version of getgrent_r() and it appears to be a 
non-standard function anyway, so this probably needs configure glue.

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