The migration from autotools to CMake in 1.1.5 wasn't as smooth as
intended. The SONAME / SOVERSION were broken in both build systems,
causing breakages in systems that upgraded from snappy 1.1.4 to 1.1.5,
as reported in https://github.com/Homebrew/homebrew-core/issues/15274
and https://github.com/google/snappy/pull/45.