Older git version does not allow fetching single specific sha1.
Change-Id: Ib795659a597042876a5c7b6fab3875fe1e39873d
Reviewed-by: Iikka Eklund <iikka.eklund@qt.io>
Reviewed-by: Heikki Halmet <heikki.halmet@qt.io>
(cherry picked from commit a2393b5882)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
