Append a compact release service version to Kleopatra's version number
This ensures that we have different version numbers for different releases without switching completely to the release service version. This fixes problems with building flatpaks because appstream-compose errors out if there are multiple <release> tags with the same version attribute in the AppStream data (org.kde.kleopatra.appdata.xml). This approach was suggested by Albert Astals Cid with reference to khelpcenter from where I borrowed some of the code.
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