* wasi-common/yanix: fix FreeBSD support * yanix: add fadvise support on FreeBSD and NetBSD * runtime,jit: use cfg(unix) instead of linux||macos
This is the wasmtime-jit crate, which contains JIT-based execution
for wasm, using the wasm ABI defined by wasmtime-environ and the
runtime support provided by wasmtime-runtime.