Added static lz4 support for roccksjavastatic

Usage:
make clean rocksdbjavastatic

Dependency:
LZ4

To install LZ4:
git clone https://github.com/Cyan4973/lz4.git && \
cd lz4/lib && \
make install

Alternativel installation method:
curl -O https://codeload.github.com/Cyan4973/lz4/tar.gz/r127
mv r127 lz4-r127.tar.gz
tar xvzf lz4-r127.tar.gz
cd lz4-r127/lib && \
make install

Signed-off-by: Pooya Shareghi <shareghi@gmail.com>

Merge pull request #545 from fyrz/RocksJava-Level-Compression

[RocksJava] Add compression per level to API