Fix minimum version to one that exists in 10.5
Fix minimum version to one that exists in 10.5

sharoonthomas/gtk-mac-integration,jralls/gtk-mac-integration,sharoonthomas/gtk-mac-integration,sharoonthomas/gtk-mac-integration,jralls/gtk-mac-integration,jralls/gtk-mac-integration,GNOME/gtk-mac-integration,sharoonthomas/gtk-mac-integration,sharoonthomas/gtk-mac-integration,GNOME/gtk-mac-integration,GNOME/gtk-mac-integration