Update genimage from version 11 to 14. A patch is required for the
tests due to differences in ext tooling.
* gnu/local.mk (dist_patch_DATA): Replace patch reference.
* gnu/packages/genimage.scm: Update package source.
* gnu/packages/patches/genimage-mke2fs-test.patch: New patch file.
* gnu/packages/patches/genimage-signedness.patch: Delete obsolete patch.
Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>
