events fatal in Solaris process contract support and tell it to signal
only processes in the same process group when something happens.
Based on information from andrew.benham at thus.net and similar to
a patch from Chad Mynhier. ok djm@
[platform.c platform.h sshd.c openbsd-compat/Makefile.in]
[openbsd-compat/openbsd-compat.h openbsd-compat/port-solaris.c]
[openbsd-compat/port-solaris.h] Add support for Solaris process
contracts, enabled with --use-solaris-contracts. Patch from Chad
Mynhier, tweaked by dtucker@ and myself; ok dtucker@