Add rustc-dep-of-std feature

[s-arash]

This feature allows this crate to be used as a dependency of the Rust standard library. My use case is in the implementation of the x86_64-fortanix-unknown-sgx target of the standard library. See https://github.com/fortanix/rust-sgx/tree/arash/insecure-time-rustc-dep-of-std. Note that insecure-time is a dependency of the standard library for the SGX target.

The pattern of introducing a rustc-dep-of-std feature seems to be the standard way of going about it. Here is an example: https://github.com/rust-lang/cfg-if/blob/main/Cargo.toml

[zesterer]

Thanks! This seems to match up with other crates I know to be in a similar situation, like hashbrown

[zesterer]

Are you looking for a new release for this?

[s-arash]

Awesome! Thanks for the quick response.

Are you looking for a new release for this?

Yes, I'd really appreciate a new release, so that I can make a new release of insecure-time.

[zesterer]

0.11.0 has now been released. Cheers!