Add lz4 to build dependencies

This commit fixes build failure due to failed "make check".

Our test-compress uses lz4cat. Binary is included in lz4 package that
used to contain both library and binaries. Since lz4-libs split-off we
need to explicitly pull-in lz4.

See: http://pkgs.fedoraproject.org/cgit/rpms/lz4.git/commit/?id=34760ea9354a972f946af0282e2c145c660a823c
1 file changed