swrap0 method
Binds a cwraped C function taking 0 arguments that returns a struct
via the WASM structure-return (sret) convention.
The single parameter is the caller-allocated pointer the struct is
written into. Always returns void, read the result back out of
the pointer you passed in.
Implementation
WF1<void> swrap0(String name) {
final f = _ws(name, 0);
return (a1) => f.run([a1]);
}