imageio_rawspeed: remove redundant flags code for non-cfa raws
(cherry picked from commit 5e4f4c95e894e20e9968f5a1f27eee42b6aaf394)
cacorrect: don't accidentally run on non-RAWs
(cherry picked from commit 4dd3a37c67f671c4a141988555a57bf57ad78357)