archlinux: fix GitCommit header
archlinux: fix GitCommit header

For some reason amd64-GitCommit didn't error before (unless I'm mistaken
and missed this...), but now it appears amd64-* is just implied. Drop
amd64-GitCommit and use vanilla GitCommit.

31z4/official-images,neo-technology/docker-official-images,infosiftr/stackbrew,thresheek/official-images,docker-library/official-images,neo-technology/docker-official-images,infosiftr/stackbrew,31z4/official-images,31z4/official-images,docker-solr/official-images,infosiftr/stackbrew,docker-library/official-images,docker-flink/official-images,docker-library/official-images,docker-flink/official-images,docker-library/official-images,neo-technology/docker-official-images,neo-technology/docker-official-images,jperrin/official-images,infosiftr/stackbrew,jperrin/official-images,jperrin/official-images,docker-solr/official-images,docker-solr/official-images,neo-technology/docker-official-images,jperrin/official-images,docker-solr/official-images,infosiftr/stackbrew,infosiftr/stackbrew,thresheek/official-images,docker-library/official-images,thresheek/official-images,docker-flink/official-images,docker-flink/official-images,dinogun/official-images,docker-solr/official-images,docker-flink/official-images,docker-library/official-images,neo-technology/docker-official-images,thresheek/official-images,jperrin/official-images,docker-library/official-images,docker-solr/official-images,thresheek/official-images,docker-library/official-images,jperrin/official-images,docker-solr/official-images,docker-library/official-images,thresheek/official-images,dinogun/official-images,docker-flink/official-images,thresheek/official-images,thresheek/official-images,docker-solr/official-images,docker-solr/official-images,dinogun/official-images,dinogun/official-images,jperrin/official-images,infosiftr/stackbrew,docker-library/official-images,infosiftr/stackbrew,neo-technology/docker-official-images,docker-solr/official-images,31z4/official-images,neo-technology/docker-official-images,thresheek/official-images,thresheek/official-images,jperrin/official-images,neo-technology/docker-official-images,jperrin/official-images,docker-solr/official-images,thresheek/official-images,thresheek/official-images,docker-solr/official-images,31z4/official-images,docker-solr/official-images,docker-flink/official-images,docker-flink/official-images,infosiftr/stackbrew,infosiftr/stackbrew,dinogun/official-images,infosiftr/stackbrew,31z4/official-images,jperrin/official-images,31z4/official-images,docker-solr/official-images,neo-technology/docker-official-images,dinogun/official-images,thresheek/official-images,dinogun/official-images,31z4/official-images,docker-library/official-images,jperrin/official-images,neo-technology/docker-official-images,docker-flink/official-images,docker-flink/official-images,docker-flink/official-images,infosiftr/stackbrew,dinogun/official-images,dinogun/official-images,dinogun/official-images,jperrin/official-images,infosiftr/stackbrew,dinogun/official-images,31z4/official-images,docker-flink/official-images,neo-technology/docker-official-images,jperrin/official-images,31z4/official-images,docker-flink/official-images,docker-library/official-images,31z4/official-images,neo-technology/docker-official-images,dinogun/official-images,infosiftr/stackbrew,31z4/official-images,thresheek/official-images,31z4/official-images,neo-technology/docker-official-images,docker-library/official-images,docker-library/official-images,31z4/official-images,dinogun/official-images