Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Fix world after byacc import:
- old yacc(1) use to magicially append stdlib.h, while new one don't
- new yacc(1) do declare yyparse by itself, fix redundant declaration of
'yyparse'

Approved by: des (mentor)

Don't let find(1) depend on struct timeb.

This structure is deprecated and only used by ftime(2), which is part of
libcompat. The second argument of get_date() is unused, which means we
can just remove it entirely.

Revert most part of 200420 as requested, as more review and polish is
needed.

Remove unneeded header includes from usr.bin/ except contributed code.

Tested with: make universe

Fixes for gcc4.x.

Submitted by: Divacky Roman <xdivac02@stud.fit.vutbr.cz>
PR: bin/84991

Fix all WARNS. Checked with "make WARNS=9". Remove unused file.

Fix to WARNS=2 level.

Tested by: AXP gcc 3.1

Clean up the 1/2 a** committing from Thu, 3 May 2001 11:05:39 -0700 (PDT).
Since then we have living with a GPL'ed find(1) due to grabbing getdate.y
from src/contrib/cvs and its user of the GPL'ed xtime.h. I don't even want
to think about how this could have affected people using our source base.

Would it have been too much trouble to do then what I did now?
Copied getdate.y (public domain) to usr.bin/find and change to use
standard system headers. find(1) now compiles simply with out having
to go to extra effort to do so.

Pointed hat to: phk
Build fixed on: gcc 3.1 using platforms