I modified a few areas to help integrate some newly documented
BUILDHISTORY_* variables. Mostly some rewriting to feature
some variables that help the user select build history features.
(From yocto-docs rev: 8cb6a09ba7f0bd645a12e6f7a93247a9f0e77980)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>