Fix legacy support=0 case and accidental double include of version headers
Fix legacy support=0 case and accidental double include of version headers

inikep/zstd,Majlen/zstd,ds77/zstd,Majlen/zstd,Cyan4973/zstd,inikep/zstd,Cyan4973/zstd,Majlen/zstd,Majlen/zstd,ds77/zstd,inikep/zstd,ds77/zstd,Cyan4973/zstd,Cyan4973/zstd,inikep/zstd,ds77/zstd,Cyan4973/zstd