Fix the Android prefab export.

[dmn-star]

closes microsoft/vcpkg#35538
closes microsoft/vcpkg#12359

[dmn-star]

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[dmn-star]

Error: You must reformat the sources or regenerate the message map. See the format.patch artifact for more information.
One-liner to apply and push the patch from the root of your vcpkg-tool repo:
gh run -R microsoft/vcpkg-tool download 7854905076 -n format.patch && git am format.patch && rm format.patch && git push
Error: Process completed with exit code 1.

no valid artifacts found to download

[dg0yt]

IMO this isn't the right direction. Triplet names don't carry much meaning. They are identifiers.

Basically, it shouldn't care about any triplet which isn't installed.
Looking at the past issues, I think what is really desired is a user provided positive list of triplets, so that you can pick some architectures.

[dmn-star]

The fix is quite simple, yet it will repair the prefab export, which has been broken for 4 (?) years.

When I think about the command line, I would just omit the triplets entirely.

vcpkg export prefab

or or if you just want to export a specific ABI

vcpkg export prefab  --ABI arm64-v8a

[BillyONeal]

which has been broken for 4 (?) years.

A broken fix is not made correct because the bug attempting to be fixed is old.

I agree with @dg0yt that you can't assume anything based on the triplet name. I can make my identical-to-wasm32-emscripten triplet named "fish".

[BillyONeal]

In addition to the triplet name issue @dg0yt pointed out this needs end to end tests to verify that it doesn't regress in the future. The reason prefab has been broken so long is that the vcpkg maintainers do not use it and do not know how to validate that it is correct. (I believe it was a community contributed feature, and that we don't have tests for it is a big part of how it was able to become broken)