Release new version with lastest LevelDB release about leveldbjni HOT 3 OPEN

If you're still around, I've been working to get a more recent build of leveldbjni working and with better platform support. So far I have Linux x86_64, Mac x86_64 and Mac aarch64 as fully automated builds in CircleCI (https://github.com/ConsenSys/leveldbjni-native) but it still uses the old leveldb and I haven't managed to get a Windows build working at all. I'd love some help if you still remember the details.

Will try and test out your branches of updated snappy and leveldb on Linux and Mac soon too. Thanks for sharing.

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So one thing I do notice with these branches is that when building leveldb, it fails to find snappy so I don't think it's building a snappy enabled version of leveldb. That seems to be true on Linux, Mac and Windows.

And on Windows it would be really helpful to know if there's a way to build the actual leveldbjni native library from the command line (and with a recent visual studio).

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Ok, managed to get snappy found on Mac and Linux by setting some env vars - probably not the "right" way to do it with cmake but effective:

CXXFLAGS="${CXXFLAGS:-} -I${BUILD_DIR}/snappy/" \
  LDFLAGS="${LDFLAGS:-} -L${BUILD_DIR}/snappy/ -lstdc++" \
  cmake ...

Consensys/leveldbjni-native#2 has the changes to build these new branches for Mac and Linux.

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