* configure.in: undo streams test. It turns out that we want sunos

	* configure.in: undo streams test. It turns out that we want sunos
	to *fail* that test, since it doesn't have a streams PTEM module
	anyhow.
	* krlogind.c: don't include sys/tty.h and sys/ptyvar.h if we don't
	HAVE_STREAMS already.
	* krlogin.c: do the same thing.

most of the files in appl/bsd should probably include one common
"system headers" include, since they duplicate so much (and not
consistently at that.) krlogind now works on SunOS 4.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@4819 dc483132-0cff-0310-8789-dd5450dbe970