merge arm64 assembly improvements
remove failing test as its test file is unavailable (too large).
State: do not wrap io.EOF Fixes pierrec#239.
Merge pull request pierrec#238 from ncruces/ncruces Fix broken tests
Merge pull request pierrec#230 from 0xAozora/v4 replace deprecated functions
lz4stream/block: compute block checksum on the block not its source. Fixes pierrec#223.
Merge pull request pierrec#216 from evanphx/b-fix-tests Reverts bc1239b, no longer needed to conform to legacy