onetbb : Add provides tbb.

[p-groarke]

Specify library name and version: onetbb/*

Allows overriding packages that use deprecated tbb with onetbb.
provides docs : https://docs.conan.io/1/reference/conanfile/attributes.html#provides
Submitting because I have to override a package that wants tbb with onetbb.

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[conan-center-bot]

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[ghost]

I detected other pull requests that are modifying onetbb/all recipe:

• [onetbb] Bump dependencies #19514
• Add onetbb/2021.5.0 needed by cctag/1.0.3 #18714
• onetbb/2021.9.0: add patch for correctly building with emscripten #17777

This message is automatically generated by https://github.com/ericLemanissier/conan-center-conflicting-prs so don't hesitate to report issues/improvements there.

[SpaceIm]

AFAIK, provides doesn't achieve what you want (allow conan to happily replace tbb by onetbb in dependency graph of recipes which would still refer to tbb). There is already a deprecated attribute in tbb recipe, so no reason to add a provides in onetbb.

Why don't you just update these recipes to depend on onetbb instead of tbb?

[p-groarke]

It does work.
I don't control the other recipes.

[p-groarke]

@SpaceIm Your casting doubt on whether it works. IIRC it works, but i'll double check a test project. We probably want this anyhow since mixing tbb and onetbb is a no-no, but if you think its a bad idea i'll close.

[p-groarke]

I must have been hallucinating, it doesn't work.