Not checking for protobuf-lite in find packages
pkgconfig(protobuf-lite) is needed as indicated by this error when building:
CMake Error at src/osm/io/CMakeLists.txt:21 (target_link_libraries):
Target "KOSM_pbfioplugin" links to:
protobuf::libprotobuf-lite
but the target was not found. Possible reasons include:
* There is a typo in the target name.
* A find_package call is missing for an IMPORTED target.
* An ALIAS target is missing.
I'm not sure how to add a find_package for a pkgconfig build dependency though, so reporting here.