appveyor: unbreak
appveyor: unbreak

(cherry picked from commit fab33a519bd2c1f2f6f434670e19792a19092f11)

darktable-org/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,LebedevRI/rawspeed