This stubs all remaining syscalls for `GOARCH=wasm GOOS=js` to return ENOSYS, instead of panic'ing. This allows us to see the parameters it receives. For example: ``` ==> go.syscall/js.valueCall(fs.truncate(path=/tmp/_Go_TestTruncate135754730,length=0)) <== (err=function not implemented,ok=false) ``` Signed-off-by: Adrian Cole <adrian@tetrate.io>