Add libbacktrace/1.0

[klimkin]

libbacktrace/1.0

See #4262

• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the
  conan-center hook activated.

[klimkin]

Could you help to understand why the "apple-clang 11.0" and "clang 3.9, libstdc++" fails, please? Log files look good.

[prince-chrismc]

Looks odd it printed 0xFFFFFFFF for a pointer frame 🤔 No clue why it failed

[conan-center-bot]

Failure in build 22 (fb81e418f1204a09525c261adc23c8c7a184b5f8):

• libbacktrace/1.0@:
  An unexpected error happened and has been reported

---

^{Note: To save resources, CI tries to finish as soon as an error is found. For this reason you might find that not all the references have been launched or not all the configurations for a given reference. Also, take into account that we cannot guarantee the order of execution as it depends on CI workload and workers availability.}

[jgsogo]

Please, read the comment above, I'll keep having a look at the unexpected error.

[jgsogo]

I see it doesn't fail in the docker image (gcc9 - Python 3.7.4), but it does in some other Python installations (newer versions, Macos). I'll try to improve the current CI to provide information about this last step where the PR is failing.

[conan-center-bot]

All green in build 23 (d24ad500c1d844f27ae38e5fd4d5706c30b090ac):

• libbacktrace/cci.20210118@:
  All packages built successfully! (All logs)