yaffs2: Adds git version recipe (initial recipe)

Added CONFIG in CFLAGS to resolve missing definition error.

Signed-off-by: Pengyu Ma <pengyu.ma@windriver.com>
xfsprogs: change DESCRIPTION to SUMMARY

Signed-off-by: Andreas Oberritter <obi@opendreambox.org>
Acked-by: Koen Kooi <koen@dominion.thruhere.net>