variants: remove hard-coded default path for CONDA_BUILD_SYSROOT

[mbargull]

In 8a32641#diff-593f4997b372b8d4a4fe630de1e497adR36 a hard-coded path was added as a default value for CONDA_BUILD_SYSROOT.
The commit message from that commit is

Set CONDA_BUILD_SYSROOT during tests to /opt/MacOSX10.10.sdk

. So, supposedly, this also wasn't meant to be added as a general default value, but just for tests.
If it is still needed to be set for some tests, feel free to add it to the appropriate place and commit to this branch (meaning, "Allow edits from maintainers." is enabled).

[msarahan]

Yeah, I think the reason why it was added there in particular is that we don't have a separate collection of variants for tests. We need to add that, probably before merging this PR.

[jakirkham]

Is this still needed @mbargull? If so, what are the next steps here?

[mbargull]

Is this still needed @mbargull?

Yep.

If so, what are the next steps here?

Merge pull request ;)

[jakirkham]

Thoughts @mingwandroid?

[mingwandroid]

Thanks @mbargull and @jakirkham

[isuruf]

Ping on this. We still carry this patch in conda-forge.

[mingwandroid]

We'll hopefully do a quick mop-up release for CB 3.20.0. I've seen nothing too serious so far, just one thing. Sometimes on very big package builds, Windows file locking prevents a shutil.move operation from working reliably. I fixed the same thing during the build phase and while I'm not 100% happy with the fix, it's better than a failing build.

[github-actions]

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