buildhistory.bbclass: create image directory when needed
buildhistory_get_imageinfo() assumed that the buildhistory directory
for the image had already been created earlier. That assumption is not
true for special images (like the virtual swupd images from
meta-swupd) where the entire traditional do_rootfs/do_image is
skipped.
Creating files-in-image.txt still makes sense for such images, so
support them by creating the directory also in
buildhistory_get_imageinfo().
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
