Search for the versioned library soname. #18
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On Linux distributions, the search path searches only for libzmq.so however that file is available only in development packages (which pull in unneeded dependencies).
Regular packages provide libraries with version in the soname, which is enough for using it through FFI.
This commit adds versioned libzmq.so to the search path of FFI.
Relevant link: https://github.com/ffi/ffi/wiki/Loading-Libraries#linux-packages
rake spec
ran successfully.