Use $CONDA_BLD_PATH in condarc too

[jakirkham]

Checklist

• Title of this PR is meaningful: e.g. "Adding my_nifty_package", not "updated meta.yaml".
• License file is packaged (see here for an example).
• Source is from official source.
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• Build number is 0.
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[github-actions]

Hi! This is the staged-recipes linter and I found some lint.

It looks like some changes were made outside the recipes/ directory. To ensure everything runs smoothly, please make sure that recipes are only added to the recipes/ directory and no other files are changed.

If these changes are intentional (and you aren't submitting a recipe), please add a maintenance label to the PR.

File-specific lints and/or hints:

• .scripts/run_osx_build.sh:
  • lints:
    • Do not edit files outside of the recipes/ directory.

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR () and found it was in an excellent condition.

[github-actions]

Hi! This is the staged-recipes linter and your PR looks excellent! 🚀

[jakirkham]

Addressed in PR: #28260