Fix git archive to not include debian directory
Fix git archive to not include debian directory

Not sure if something changed in git, but we discovered the debian
directory was being included in the dist tarball, after Geary 0.3.  This
change seems to fix it in modern git.

kpiwko/geary,aatishnn/geary,emersion/geary,AtticHacker/geary,martinra/geary,AtticHacker/geary,tshikaboom/geary,robol/geary,githubnemo/geary,jimbonator/geary,aatishnn/geary,aatishnn/geary,robol/geary,emersion/geary,mjog/geary,martinra/geary,MohamedIM/geary-unofficial,AtticHacker/geary,glebihan/geary,abn/geary,geekvigilante/geary,glebihan/geary,jimbonator/geary,githubnemo/geary,rschroll/geary,jimbonator/geary,robol/geary,mjog/geary,glebihan/geary,rschroll/geary,githubnemo/geary,mjog/geary,emersion/geary,tshikaboom/geary,martinra/geary,tshikaboom/geary,mpdeimos/geary