[coreboot] lar directory handling patch

[Myles Watson]

This patch fixes lar path handling.  In particular, it adds new
members to the file struct for pathname and compression, so that
directories can be correctly recursed and files can be renamed when
being added.  This fixes a buildrom breakage when adding the payload
as well.

file-by-file changes:

util/lar/lar.c:
	make error messages more verbose
	pass a pointer to the file structure instead of the name
	start with a NULL path before parsing the name

util/lar/lib.c:
	change handle_directory to use a path name and respect nocompress
	change add_files to use lar_process_name instead of its own local version
	use sensible defaults for new file members when listing or extracting
	free pathname if allocated	

util/lar/lib.h:
	add new members to struct file
	change prototypes of add_files and lar_add_file

util/lar/stream.c:
	change lar_add_file to use pathname and compression from struct file

Myles

Signed-off-by: Myles Watson <mylesgw at gmail.com>
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