Fast-forward std.os.bits.wasi to match preview1 snapshot ABI
`wasi_snapshot_preview1` introduced a couple of ABI changes. This
commit fast-forwards the types and consts defined in `std.os.bits.wasi`
to match those changes.
b23a87953aJakub Konka committed on 4/30/2020, 5:28:50 PM· committed by Andrew Kelleyparent7192ca1