gptfdisk: remove warning message from target system

A recent change in libuuid made warning when running
sgdisk. Backport patch from upstream to silent warning.

The warning:
    "Warning! Unable to generate a proper UUID! Creating an improper one as a last
     resort! Windows 7 may crash if you save this partition table!"

Signed-off-by: Peter Bergin <peter@berginkonsult.se>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit ce6491b9)
Signed-off-by: Steve Sakoman <steve@sakoman.com>