We depend on 3.7.0 //or later//. The fact that the dependency is (by
default) explicitly equal, was not clear before.

Reviewed-by: Mathieu Duponchelle <mathieu.duponchelle@collabora.co.uk>
Signed-off-by: Philip Withnall <philip.withnall@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D3721