Remove all references to "make depend" from regress.

Kill old crap that is unbelievably slow and produces hundreds of false
positives. Fixing it is not worth the hassle; if we want something
like this, it ought to be done in the context of makewhatis(8) and
mandoc.db(5). As it stands, its only effect is to discourage people
from running our regression suite, which is bad. I got a report
from daniel@ that part of it even crashes.

Don't ask people to send regress logs to a non-existant email address.

OK deraadt@

introduce explicit MAKE_FLAGS variable, which has no surprising behavior
dependent on make, and fixes the regress problem reported by David Krause.

we can add the gnu directory to the regress build now

First regression test for pkg_add, checking packages-specs lists.
(the nice thing about having this as perl modules is that we CAN write
regression tests)

add misc

trim some whitespace in the mail subject

comment out the mailing suggestions, since the address doesnt exist yet

- Precede internal bsd.regress.mk variables with a _
- Rename old variables to be easier to read, and deprecate old
variables. The old variables will still work, but emit warnings.
- REGRESS_SKIP_SLOW only needs to be non-empty now, not explicitly
set to 'yes'
- REGRESS_LOG can contain more than one file to append results to
- ERRORS variable can be set in Makefile to emit warnings or indicate
fatal errors.
- Add REGRESS_MAIL variable which can be set to an email address to
send results to. Currently this only works for a full regression
run, since art doesnt want partial run results
- sync bsd.regress.mk(5) with these changes

ok art@ , also looked over by miod@

no more need to explicitly specify regress: _SUBDIRUSE targets anymore.
XXX - what about the install targets?

Actually, remove the whole "missing" line.

Remove some parts that are there from the "missing" line.

regress has a libexec subdir now.

Document some.

add MAKEDEV regress

enable regress for sbin/pfctl

trivial regression tests for md5/sha1/rmd160 driver

$OpenBSD$

+ usr.bin

some man page tree checking tools from tchrist@perl.com

branches: 1.1.1;
Initial revision