Commits on Sep 18, 2024

1. Add version.h defining WASI_LIBC_VERSION …

   This change re-imagines [wasi-sdk#487] entirely in `wasi-libc`. Instead
   of generating a `version.h` header late--in `wasi-sdk`--it is generated
   immediately when `wasi-libc` is built. This has the disadvantage that we
   don't know what `wasi-sdk` this will be used in... but almost: when
   releasing `wasi-sdk`, we _should_ be tagging the `wasi-libc` repository.
   If we did that more faithfully ([docs]), this commit would generate:
   
     ```c
     // Generated by wasi-lib's `Makefile`.
     #ifndef VERSION_H
     #define VERSION_H
     #define WASI_LIBC_VERSION "wasi-sdk-24"
     #endif
     ```
   
   Using the magic of `git-describe`, if someone is using `wasi-libc`
   directly, they may see a version like: `wasi-sdk-22-19-g5d3c5e9-dirty`.
   This should be read like: `<wasi-sdk tag>-<# commits since
   tag>-<current commit>-<is the repository dirty?>`.
   
   [wasi-sdk#487]: WebAssembly/wasi-sdk#487
   [docs]: https://github.com/WebAssembly/wasi-sdk/blob/754aec3/RELEASING.md?plain=1#L22

   

   abrown committed Sep 18, 2024
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