Fix no_std with features

[sharksforarms]

Introducing wyz/funty caused no_std to fail, using them with features fixes it

Would you be interested in having a CI check for no_std? I could make a PR, something similar to this: https://github.com/sharksforarms/deku/tree/master/ensure_no_std

(That's how I found this failure)

[myrrlyn]

I run this as my test routine locally, so it's very weird to me that I've never seen this before. Regardless, your updates to the manifest are correct. Thanks!