build: Allow backend libraries to have separate LT versions from libfolks.so
With the addition of the dummy backend, backend libraries (such as libfolks-dummy.so) no longer necessarily have the same stability guarantees as the core of libfolks. Consequently, they must have separate LT versions. These versions will be incremented in-line with the core LT version, but may also be incremented separately. They don’t affect whether libfolks will load a given backend module (that’s predicated on the core LT current version); merely whether client code needs to be re-linked against a given backend library due to an ABI-incompatible change in its backend-specific API. https://bugzilla.gnome.org/show_bug.cgi?id=711544
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bf4f7438