Difference between cmake and meson installation about libosmscout

[Vedingrot]

Also meson build generate proper soname as I suggested in #1581

[Framstag]

OK. Note that official releases uses chronver. So in general soname will not be equal to major version. There is also an aggrement that users are responsible for correct versioning, patching etc...This should not be a problem on mobile devices. Of course for classic linux distribution packaging another solution has to be found.

I also decided that developer builds to not be correct versionied artefacts.

Background: Proper semantic versioning is a pain. For libosmscout the API is not clearly defined, making strict semver difficult.

Nevertheless, the target director problems is a bug. Since my cmake know how is limited, I would except patches for this or at least hints to cmake documentation that describe the best practise solution pattern for this.