Fix compile error for no std

[ephraim71]

From :
#343

no_std already works for these :
cargo build --target aarch64-unknown-none --no-default-features
cargo build --target thumbv6m-none-eabi --no-default-features

To use no_std without having to cross compile, cdylib has to be excluded.

[gemini-code-assist]

Summary of Changes

Hello @ephraim71, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a compilation error that occurs when the library is built in a no_std environment. The core change involves adjusting the build configuration in Cargo.toml to conditionally enable the cdylib crate type only when the std feature is active, thereby preventing cdylib from being built in contexts where the standard library is not present.

Highlights

• Build Configuration: Modified the Cargo.toml file to make the cdylib (C dynamic library) crate type conditional on the std feature. This change ensures that the C dynamic library is only built when the standard library is available, specifically addressing and resolving potential compilation errors in no_std environments.

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[gemini-code-assist]

Code Review

This pull request fixes a compilation error for no_std builds by conditionally enabling the cdylib crate type based on the std feature. A comment has been suggested to improve the maintainability of this configuration.

[gemini-code-assist]

Adding a comment to explain why cdylib is only built with the std feature would improve long-term maintainability and clarify the intent for future contributors.

# The `cdylib` crate type is only supported with the `std` feature.
[target.'cfg(feature = "std")'.lib]

[ephraim71]

added comment

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.64%. Comparing base (109ee42) to head (da78dc2).
⚠️ Report is 66 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #408      +/-   ##
==========================================
- Coverage   83.87%   82.64%   -1.23%     
==========================================
  Files          24       24              
  Lines        3813     3566     -247     
==========================================
- Hits         3198     2947     -251     
- Misses        615      619       +4     

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[ChristopherRabotin]

Looks good, thanks @ephraim71!