Draft: replace build_bench_env.sh with a Makefile

[derSteFfi]

pushing this draft as a starter to get your opinions - I'll be on vacation the next weeks and won't be working on it anyway. There are a few open tasks, but the general vibe should already come across. Feedback very welcome.

Decisions made:

• VERSIONS: demand versions instead of reporting them in the end
• switched from git cloning to grabbing a snapshot of the reqeuested version from github
• dh: move build directory (dh/src/build -> dh/build)
• lua: moved to extern benchmarks because it is built in extern/
• benchmarks: if something is updated, CMakeLists.txt needs to be touched (or replaced with a Makefile longterm)
• sm: instead of default target, switched to building supermalloc only
• linux: updated version to LTS series
• lean: switched to smaller build target

TODO

• put archives in extra storage after versionizing them (see here) docker caches these already
• adapt CI-scripts to use Makefile
• package installation
  • document in README: bazel5 missing, rest is done
  • move to CI instead of build_bench_env.sh
• bench.sh needs to be adapted in the way it finds 'installed allocators' -- fixed in Detect allocators present and functional #247

open Questions:

1. partial_checkout
   1. scudo
   2. lp Also, github does not serve archives on that repo. Re-add when solved.
2. pa: re-add, but smaller? (see here), but: Add partitionalloc #184
3. sed patches in Makefile: port to proper patch? at least gd, hd, rp are patched with sed right now, we could port that to a patch

[derSteFfi]

one ToDo I forgot in notes: tar can exclude files from extraction. The current shell-script does delete a few folders in a few repositories - we could modify the tar call to not extract them in the first place.

[mjp41]

LGTM, thanks for the changes.

@jvoisin, @derSteFfi I don't want to hold these changes holding off on fixing issues for individual allocators/platforms. But I really like to only have a Green CI. Thoughts?

[derSteFfi]

Absolutely agree. I still have at least scudo and lp on my list and will re-check all comments here afterwards. With that fixed, I would also be pro-merging to make it easier to hunt individual bugs. The branch-switching sometimes takes time, and we would have a clear stand - fixing individual things is much easier than to always have to model the whole process.