recursive_action: add ACTION_SORT flag ...

Add a flag to sort directory entries before recursing into them.

Since this part of lib/ is used inside barebox as well as in
scripts/bareboxenv.c, we cannot easily use stringlists from lib/, which
would have made the code a bit nicer.

Signed-off-by: Florian Bäuerle <florian.baeuerle@allegion.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts: Make list implementation usable ...

The list implementation in scripts/ includes poison.h which doesn't
exist. Remove the inclusion and add the defines from poison.h that we
need.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts: Add big endian conversion macros to endian.h ...

Some programs need the big endian macros, add them to andian.h

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts/include: Add ARRAY_SIZE ...

ARRAY_SIZE is another define commonly used in tools. Add it to the
kernel includes.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts: Add common header files for tools ...

This imports the tools/include dir from the Kernel as of 4.5-rc1 to
barebox.
The Kernel has many useful defines and helpers which are often
duplicated in the different tools. Let's create a copy of them
in a common place for all tools.

Some files have been skipped for now as I currently see no use for them:

include/linux/filter.h
include/linux/hash.h
include/linux/rbtree.h
include/linux/rbtree_augmented.h

They can be added later if needed.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>