kbuild: mailing list has moved

The old list at sourceforge had a few issues:
- it was subscriber-only
- it were relying on moderation

And I could see several mails did not get to the list lately
so I decided this was a good time for a new list.

I already requested marc.info to archieve the new list -
and I dunno where else the old list was archieved but we
ought to update.

I have no access to the list of subscribers on the old list
so people will have to subscribe manually.

How to subscribe:

send a mail to: majordomo@vger.kernel.org
containing following text:
subscribe linux-kbuild

See also http://vger.kernel.org/vger-lists.html

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>