8ebe12f553
* Use generated type bindings. Use the witx API descriptions to generate the bulk of the contents of host.rs, wasi.rs, and wasi32.rs. This also prunes out many of the miscellaneous libc definitions from those files which aren't currently in use by wasi-common. If there's anything removed that's still needed by someone, it's easy to add things back in. * Remove unneeded iovec conversion routines.