scm: git: get "extra_report_last_commit" value from extra_info (#8365, #7047)....
scm: git: get "extra_report_last_commit" value from extra_info (#8365, #7047).
Browsing repository tree performance problem is git only.
So, adding new "report_last_commit" column is very expensive.
git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@5768 e93f8b46-1217-0410-a6f0-8f06a7374b81