708: runtime-c-api: not installing cranelift if not necessary r=Hywan a=YaronWittenstein
having `default-features = false` lets us install the `runtime-c-api` with `default-backend-singlepass` without installing also `cranelift`
Co-authored-by: Yaron Wittenstein <yaron.wittenstein@gmail.com>
566: doc(runtime-c-api) Document and reorganize `exports.rs`. r=Hywan a=Hywan
This patch moves all structs at the beginning of the file, and
documents them.
Co-authored-by: Ivan Enderlin <ivan.enderlin@hoa-project.net>
663: Bump nix from 0.14.1 to 0.15.0 r=Hywan a=dependabot-preview[bot]
Bumps [nix](https://github.com/nix-rust/nix) from 0.14.1 to 0.15.0.
<details>
<summary>Changelog</summary>
*Sourced from [nix's changelog](https://github.com/nix-rust/nix/blob/master/CHANGELOG.md).*
> ## [0.15.0] - 10 August 2019
> ### Added
> - Added `MSG_WAITALL` to `MsgFlags` in `sys::socket`.
> ([#1079](https://github-redirect.dependabot.com/nix-rust/nix/pull/1079))
> - Implemented `Clone`, `Copy`, `Debug`, `Eq`, `Hash`, and `PartialEq` for most
> types that support them. ([#1035](https://github-redirect.dependabot.com/nix-rust/nix/pull/1035))
> - Added `copy_file_range` wrapper
> ([#1069](https://github-redirect.dependabot.com/nix-rust/nix/pull/1069))
> - Add `mkdirat`.
> ([#1084](https://github-redirect.dependabot.com/nix-rust/nix/pull/1084))
> - Add `posix_fadvise`.
> ([#1089](https://github-redirect.dependabot.com/nix-rust/nix/pull/1089))
> - Added `AF_VSOCK` to `AddressFamily`.
> ([#1091](https://github-redirect.dependabot.com/nix-rust/nix/pull/1091))
> - Add `unlinkat`
> ([#1058](https://github-redirect.dependabot.com/nix-rust/nix/pull/1058))
> - Add `renameat`.
> ([#1097](https://github-redirect.dependabot.com/nix-rust/nix/pull/1097))
>
> ### Changed
> - Support for `ifaddrs` now present when building for Android.
> ([#1077](https://github-redirect.dependabot.com/nix-rust/nix/pull/1077))
> - Minimum supported Rust version is now 1.31.0
> ([#1035](https://github-redirect.dependabot.com/nix-rust/nix/pull/1035))
> ([#1095](https://github-redirect.dependabot.com/nix-rust/nix/pull/1095))
> - Now functions `statfs()` and `fstatfs()` return result with `Statfs` wrapper
> ([#928](https://github-redirect.dependabot.com/nix-rust/nix/pull/928))
>
> ### Fixed
> - Enabled `sched_yield` for all nix hosts.
> ([#1090](https://github-redirect.dependabot.com/nix-rust/nix/pull/1090))
>
> ### Removed
</details>
<details>
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- See full diff in [compare view](https://github.com/nix-rust/nix/commits)
</details>
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