The CUPS plugin in src/plugins/printsupport/cups actually links against
libcups.so, so cups-client needs to be more than a build-time dependency.
This is part of Yuri Victorovich's Qt 5.5.1 patch set (which he submitted
without knowing kde@ was already working on the update). This bug fix is
orthogonal to the 5.5.1 update and we had not spotted this before, so I am
landing this separately.
PR: 205805
Submitted by: Yuri Victorovich <yuri@rawbw.com>
