message: Activate WebAssembly Features supported by iOS 15
  This includes:
  Bulk memory operations
  Non-trapping float-to-int conversions
  This also activates `Import & export of mutable globals`. I'm not sure
  if it does anything, but LLVM supports it as well as all browsers, so we
  might as well activate it too.
diff: @@ -16,7 +16,7 @@ execSync(
  stdio: "inherit",
  env: {
  ...process.env,
  - 'RUSTFLAGS': '-C target-feature=+sign-ext',
  + 'RUSTFLAGS': '-C target-feature=+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext',
  },
  },
  );
  