KIPI refuses to load plugins with error messages like this:

gwenview(5156)/KIPI (loading) KIPI::PluginLoader::init: Plugin  "Imageviewer" has a SO version ( 0 ) which is different than libkipi ABI version ( 10 ).  Refusing to load.

The reason for this is that the desktop files for the plugins all have the following line:
X-KIPI-BinaryVersion=

This, in turn, is because the desktop.cmake files have the following line:
X-KIPI-BinaryVersion=${KIPI_SO_VERSION}
and KIPI_SO_VERSION is never set in CMake.

I'm not sure where this information should be obtained from.  The only place KIPI exports it is in version.h, and parsing it out of there doesn't seem very clean.

Perhaps KIPI should provide a KipiConfig.cmake file, or something.

Reproducible: Always