RE: Initial patch for toolset modification proposal

Round two, hopefully this hits the ml this time.

Attached are two patches- one for the tests modules (modifying appchk
and libchk), the other for build-env (modifying lsbcc).

Adds the following functionality-
If the env var LSB_PRODUCT is available, sets the default product to the
val- valid settings are [desktop|core], else defaults to core.

Command line addition is=20
-T [core|desktop], and --lsb-product [core|desktop]

If defined, again, must be valid- overrides any env specification.  All
is an unstated product option- -A functionality is rolled in via the all
product target (thus -A was removed).

A patch for cmdchk will be following tomorrow, just working out a tweak
to the Commands table to hold product info in the meantime.

Comments/feedback desired (would like to push it into cvs as soon as
it's hit the ml, and folks have had a chance to respond).

Thanks,
~brian