christos 17b3a275d4 Fix PR/2837: su [login [args]] had the wrong usage and did not work properly. Build the correct argument list and add -c for the shells.
Fix PR/2839: su will not build with Kerberos.

- Also:
	-Don't coredump when $TERM is not set.
	-Add prototypes, remove local old style declarations of system
	 functions.
	-Recognize shells that contain "csh" as being csh alike.
	-Don't build with SKEY unconditionally. Obey bsd.own.mk.
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