It doesn't build anymore. Disable until someone has managed to fix the
errors:
gmake[2]: *** [CMakeFiles/Makefile2:484: CMakeFiles/rocksdb.dir/all] Error 2
gmake[1]: *** [CMakeFiles/Makefile2:491: CMakeFiles/rocksdb.dir/rule] Error 2
gmake: *** [Makefile:208: rocksdb] Error 2
thread 'main' panicked at '
command did not execute successfully, got: exit code: 2
build script failed, must exit now', /home/builder/.cargo/registry/src/github.com-1ecc6299db9ec823/cmake-0.1.42/src/lib.rs:861:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
