libbpf: add SONAME to shared object

libbpf: add SONAME to shared object

tools/lib/bpf/libbpf: Add proper version to the shared object.

Add versioning to the shared object to make it easier on distros to
distribute the library without having to watch for API/ABI versioning.

This is similar to the change made to tools/lib/lockdep/Makefile in
be227b45fb228adff4371b8de9e3989904209ff4.

Signed-off-by: Hilko Bengen <bengen@debian.org>
[bwh: Drop unnecessary changes]

Gbp-Pq: Topic bugfix/all
Gbp-Pq: Name libbpf-add-soname-to-shared-object.patch