lz4 library fork is old

[lukehutch]

Can the C++ compatibility changes to the lz4 library fork (#13) be upstreamed, and/or the swri-robotics fork of the lz4 library be updated to 1.6.0? (The current version is 1.5.0.)

Although note that there is a vulnerability in the latest LZ4 native library version (1.9.1):

lz4/lz4-java#150