When the PR service is not enabled, the versions can go backwards and there
are cases we don't want to know about this. This patch adds a variable
allowing these checks to be turned off whilst still using buildhistory.
(From OE-Core rev: 49f33a42e93711c96fbb099f3e6ee7f092d7b356)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>