Investigate flakiness while including stdio.h on lite

[anutosh491]

The header is obviously being preloaded and is a part of xcpp.data but including it may or may not work

1. doesn't work

2. works

Similar can also be seen for the cstdio header.

[anutosh491]

Should be addressed through
emscripten-core/emscripten#24420

[anutosh491]

This is now fixed. No more flakiness while including stdio.h