This is required to enable HiDPI support for the Retina displays. The
Info.plist that comes with Qt had this, but the one we supply with
Subsurface didn't.
Done-with: Jake Petroules <jake.petroules@petroules.com>
Signed-off-by: Thiago Macieira <thiago@macieira.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
28d0cb8e2c