syslog-ng: add util-linux to DEPENDS list

Add util-linux to the DEPENDS list to get rid of the following QA
warning:

syslog-ng-3.5.4.1: syslog-ng-libs rdepends on util-linux-libuuid, but it isn't a build dependency? [build-deps]

Signed-off-by: Dmitry Eremin-Solenikov <dmitry_eremin@mentor.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>