bootimage.bbclass, zisofs-tools-native: add ability to compress ISO images
The mkzftree is needed to allow ISO images to be compressed with
minimal runtime overhead. Below is an example of the savings on a
core-image-minimal.
Before ls -l:
24117248 core-image-minimal-qemux86-64.iso
Using the mkzftree ls -l:
16777216 core-image-minimal-qemux86-64.iso
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Reviewed-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>