Andrew Kelley 21565ca991 restore -target wasm32-freestanding-musl for C headers
See #5854

Some tiny tweaks too:
 * Use `wasm-freestanding-musl` instead of `wasm32-freestanding-musl`,
   making it pointer-size-agnostic.
 * Fix trying to build non-existent wasm musl start files.
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