Pass the --generic-binary flag to compile-wasm-binary to try to pre-warm the binary

I am kind of grasping for straws at this point. Running compile-wasm-binary at serve/test time won't work because the file system is already write-protected at that point. Maybe we could find a way to deal with that, but I'd like to try a few flag combinations to see whether we can compile the WASM binary in a portable way.