[3.2] replace git commands from nodeos' & launcher's cmake with libversion usage #71
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libversion is the canonical method by which components should be retrieving the build version. But both nodeos' & eosio-launcher's CMakeLists were running git to retrieve a version. Remove that and replace with libversion usage instead. libversion needed a method added to retrieve the git hash as nodeos' get_info server_version returns the first 4 bytes of the git hash.