skiboot/ccan/ is a minimally modified version of upstream ccan that is
hosted at github.com/rustyrussell/ccan.git

This version is taken from ccan.git commit ca7c5a9e04f3 ("ccan: make tal_dump()
format more regular.") with these modules:

  array_size
  check_type
  container_of
  heap
  short_types
  build_assert
  endian
  list
  str

Generated with `./tools/create-ccan-tree -b make ...` and replacing the
corresponding directories in skiboot/ccan/, then skiboot/ccan/skiboot.patch
is applied.

The only other differences from upstream are the additions under the ccan/
directory of this file README.skiboot, Makefile.inc, Makefile.check, config.h,
tap/tap.h, skiboot.patch.

Local ccan changes should be kept to a minimum, documented here as necessary,
and submitted upstream if possible.