ubi-utils-klibc: initial commit of version 1.4.9

* Initially only ubiattach was targeted (for kexecboot project).
* Based on klibc_1.5.25, will be revised once new klibc is out.

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>