fmt: relocatable shared lib on macOS + don't fail if baremetal not in settings.yml + modernize

[SpaceIm]

closes #9058

• see [conan-center] Add a hook to check whether installed shared libs are relocatable on Linux & macOS hooks#376

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• I've followed the PEP8 style guides for Python code in the recipes.
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[ghost]

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

• Test other generators: run several tests in test_*/conanfile.py #8389

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

[SpaceIm]

@jgsogo @uilianries CI is sick? All the PR fail today.

[jgsogo]

@jgsogo @uilianries CI is sick? All the PR fail today.

We are trying to figure out what's happening. We are seeing errors from very simple commands like git clone, git merge, conan config home`,... we will try to update and we will trigger those PRs one by one, to see if we find some pattern or something reproducible.

Maybe it was just the PR to Qt 😅 (just joking).

[conan-center-bot]

All green in build 6 (4b286a862d91e34305231694f537da78f04ba933):

• fmt/5.3.0@:
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