Add ABI version
From the discussion in !77 (closed), consider adding ABI version, after migrating the build mechanism to automake and libtool. On advantage is libtool can also manage Darshan's shared library's soname. See references below for GNU ABI versioning.
https://www.gnu.org/software/libtool/manual/libtool.html#Updating-version-info
https://doc.dpdk.org/guides-20.02/contributing/abi_versioning.html