libunistring: update 0.9.10 -> 1.0

Delete patches, as one is a backport, another patches code that upstream removed.

License-Update: license changed to gplv2+
https://git.savannah.gnu.org/gitweb/?p=libunistring.git;a=commitdiff;h=87f797a50b854a4a2231203c25adbcec4f0dcd05



Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>