ANN: Test builder change

[Patrick Georgi]

Hi all,

I just changed the "coreboot" builder on http://qa.coreboot.org/ to use the
just fixed "what-jenkins-does" build target (defined in
$(top)/Makefile.inc), so all future builds will use that instead of the
hard coded sequence of commands that used to be defined in our build
environment.

I plan to move the "coreboot-gerrit" builder over in about a week. This
means that from that point on, contributions on gerrit that predate the
inclusion of http://review.coreboot.org/#/c/11097/ will break.

Therefore if you have long-running development branches, please remember to
rebase them to a current upstream or you'll get a build error after pushing
them.

Thanks,
Patrick