HEADSUP: ibcs2 and svr4 compat removed, linux to follow

[Poul-Henning Kamp]

The ibcs2 and svr4 compatibility code has outlived their useful lives,
mainly because their target platforms are practically extinct.

They have been eliminated from -current today.

The change consists of the elimination of the following directories
and assorted changes to makefiles and sys/conf and various NOTES
to record this fact:

	compat/svr4
	dev/streams
	i386/ibcs2
	i386/svr4
	modules/ibcs2
	modules/svr4


-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by
incompetence.