Auto merge of #75772 - tmiasko:io-maybe-no, r=dtolnay

Auto merge of #75772 - tmiasko:io-maybe-no, r=dtolnay

Remove unused `Maybe` wrapper around raw standard streams

* Remove result type from raw standard streams constructors
* Make raw standard stream constructors const
* Remove wrapper type handling absent raw standard streams

cargo checked with:

```shell
env CC=true ./x.py check library/std/ \
  --target i686-unknown-linux-gnu \
  --target wasm32-unknown-emscripten \
  --target wasm32-wasi \
  --target x86_64-fortanix-unknown-sgx \
  --target x86_64-pc-windows-gnu \
  --target x86_64-unknown-cloudabi \
  --target x86_64-unknown-hermit \
  --target x86_64-unknown-linux-gnu \
  --target x86_64-uwp-windows-gnu \
  --target x86_64-wrs-vxworks
```

Note: Last target doesn't compile currently.