got_revision not tracked for perforce

[dsallings]

(this is a bug I filed on sf in August 2007 -- didn't realize you guys moved)

I was attempting to include the latest perforce changeset in my build and found that got_revision is never populated.

I couldn't find a way to generically handle this (especially since p4 doesn't actually seem to do much with changesets), but it should work at least in the case where buildbot syncs to a particular revision.

The attached patch (against whatever I just pulled down with darcs) will set got_revision to the requested revision.

[dsallings]

make got_revision work for perforce builds

[dustin]

solved by a patch by jgraff:  http://github.com/jgraff/buildbot/commit/ab61561c9bc98d69b64db2b3bdb5c05dce969264