Fix git commit id comparison

Is this change appropriate? It would otherwise fail for me:
I would get the following error when running ./build-and-install-locally.sh:

Github repository reference doesn't match! We got 
                gitver=321d399fae84116eaba36e11e58118515000d81d instead of expected dpkg_pu_git_version=9673d63303211fdefe650f2974d35d326929d0fd