v1.3.8
fix confusion between unsigned <-> U32
improved ZSTD_compressBlock_opt_extDict_generic
Update BUCK files
fixed zlibwrapper examples build
zlibWrapper/README.md: updated info about gzip file access functions
updated zlib copyright notice
updated license header
fix pzstd compatibility with mingw
ensure dependency for zlib wrapper
updated a bunch of headers
fixed remaining searchLength invocations