zxing-cpp from KDE:Applications project

需要 KDE Frameworks5 openSUSE Leap 15.6 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/KDE:Applications/KDE_Frameworks5_openSUSE_Leap_15.6/KDE:Applications.repo
zypper refresh
zypper install zxing-cpp