base.bbclass: Update build_summary for bitbake 1.8.x
base.bbclass: Update build_summary for bitbake 1.8.x

bitbake 1.8.x has a broken bb.plain.  This means that our build
simply blows up before we can tell the user to upgrade to BB_MIN_VERSION.
Reported by Christian Poessinger.

Signed-off-by: Tom Rini <4c3d5c8f8c21c27dd329bd585f481113514551fd@mentor.com>

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