Make cmp -s work properly if skip values are given.  Also, exit(1) is now exit(DIFF_EXIT).
Make cmp -s work properly if skip values are given.  Also, exit(1)
is now exit(DIFF_EXIT).

PR:		18597
Submitted by:	Anatoly Vorobey <mellon@pobox.com>
Committed at:	Usenix terminal room

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase