fmt: add patch for 11.2.0 to build with libc++-21

[b1ackviking]

Summary

Changes to recipe: fmt/11.2.0 to fix build errors with clang 21 on macOS

Motivation

fmt/11.2.0 build fails with clang 21 + libc++-21 on macOS (installed from homebrew) as described in fmtlib/fmt#4520

Details

Applied patch from this commit: fmtlib/fmt@f434546

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• Read the contributing guidelines
• Checked that this PR is not a duplicate: list of PRs by recipe
• Tested locally with at least one configuration using a recent version of Conan

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[b1ackviking]

It is possible that other fmt versions may require this patch to build with libc++-21 since it stopped providing malloc and free via transitive includes. I can not verify that at the moment.

UPD: I managed to check some other versions:

• 11.1.1, 11.1.3, 11.1.4, 11.2.0 are affected with the same error, should I add the same patch to them?
• <=11.1.0 build fails with another error 'call to consteval function XXX is not a constant expression', I am not sure if it's worth fixing here

[uilianries]

@b1ackviking The fmt just released the version 12.0 with that proper fix: fmtlib/fmt#4477. Would it be enough to update your dependency to use fmt/12 instead? (Need a PR for a bump version first).

[b1ackviking]

@uilianries Thanks for the info. Yes, I can switch my code to use 12.0.0, it works fine for me.

I have just opened a PR for adding 12.0.0 to CCI #28418

Should I close this one now?

[uilianries]

@b1ackviking Thank you for your quick action with that PR! Don't worry about this one, I marked your new PR to close this one once it's merged. Regards!