Update zxing-cpp and fix compilation

Status Job ID Name Coverage
  Test
failed #18274
allowed to fail
clazy

00:02:04

passed #18275
qmllint

00:00:18

 
  Build
passed #18279
archlinux

00:02:45

passed #18278
debian-sid

00:01:30

passed #18277
neon-bionic

00:01:32

passed #18276
ubuntu-trusty

00:01:04

 
  Deploy
passed #18282
allowed to fail
android

00:33:14

passed #18280
allowed to fail
linux-appimage

00:06:36

passed #18283
allowed to fail
mac-osxcross

00:11:32

passed #18281
allowed to fail
windows-mxe

00:06:03

 
Name Stage Failure
failed
clazy Test
  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:10 (project)


-- Configuring incomplete, errors occurred!
See also "/builds/kde/kaidan/build/CMakeFiles/CMakeOutput.log".
See also "/builds/kde/kaidan/build/CMakeFiles/CMakeError.log".
ERROR: Job failed: exit code 1