Remove the RUSTFLAGS enable method from Readme.md

It is a worse option than using `CARGO_PROFILE_DEV_CODEGEN_BACKEND`.
When using `--target` it doesn't apply to build scripts and proc macros.
It also overrides any `RUSTFLAGS` you may have set in an env var or
cargo config.
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bjorn3 2024-07-20 15:26:46 +02:00 committed by GitHub
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@ -16,7 +16,6 @@ $ rustup component add rustc-codegen-cranelift-preview --toolchain nightly
Once it is installed, you can enable it with one of the following approaches:
- `CARGO_PROFILE_DEV_CODEGEN_BACKEND=cranelift cargo +nightly build -Zcodegen-backend`
- `RUSTFLAGS="-Zcodegen-backend=cranelift" cargo +nightly build`
- Add the following to `.cargo/config.toml`:
```toml
[unstable]