wasi,cc: fix naming and add stubs for building

Rename include dir to match the convention:
  from `wasm32-wasi` to `wasm-wasi-musl`

Add building stubs which will be used to build and cache WASI
libc sysroot.
7b74de7d71Jakub Konka committed on 5/20/2021, 2:54:00 PMparent782cfed
64 files changedLine totals unavailable