CMake: align the VERSION of the library with libtool practices #2911
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Currently (at least as of 8.1.1) we don't have the same .so.x.y.z
numbers for the libtool and cmake builds (the y and z are swapped for
the cmake build). While only the SONAME (the .x part) mostly matters,
it is probably better to stick with the libtool convention to determine
the y and z.
This patch should make it easier by setting explicitly each of the
current, revision, age and computing automatically
x = current - age
y = age
z = revision