There is now support for getting the AutoRotate value from Canon photos. The main value from this is when Orientation does not reflect the correct orientation of a contained thumbnail (Canon cameras seem to, in some situations, rotate the image, reset the Orientation tag, but then leave the thumbnail as it was).
However, this is also groundwork to be able to get more tags from Canon's own maker note tags, if there is interest in it.
This release also includes a couple of custom build fixes which will make the build smaller in some circumstances (mainly when using PNG and excluding exif and iptc).