mesa: Changes to 'gallium-0.1-dri2'

[Keith Whitwell]

>
> This update added new revisions after undoing existing revisions.  That is
> to say, the old revision is not a strict subset of the new revision.  This
> situation occurs when you --force push a change and generate a repository
> containing something like this:
>
>  * -- * -- B -- O -- O -- O (36f6605f81b7c067c393ffb529916cf024b16c73)
>            \
>             N -- N -- N (2110fd04fb78978d8e3dfd7570bafe348766ddbe)
>
> When this happens we assume that you've already had alert emails for all
> of the O revisions, and so we here report only the revisions in the N
> branch from the common base, B.


Cool, I think...  how did that happen & what does it mean?

Keith