BLD Add DISTDIR variable. ### Description

Adds `DISTDIR` env variable that points to the directory where libraries should be copied to when building shared libraries with recipe.

### Checklists

- [x] Add new / update outdated documentation

package:
  name: setuptools
  version: 65.6.3
  top-level:
    - _distutils_hack
    - pkg_resources
    - setuptools
source:
  url: https://files.pythonhosted.org/packages/ef/e3/29d6e1a07e8d90ace4a522d9689d03e833b67b50d1588e693eec15f26251/setuptools-65.6.3-py3-none-any.whl
  sha256: 57f6f22bde4e042978bcd50176fdb381d7c21a9efa4041202288d3737a0c6a54
build:
  post: |
    find build/setuptools-*/dist -name '*.exe' -delete
requirements:
  run:
    - distutils
    - pyparsing
about:
  home: https://github.com/pypa/setuptools
  PyPI: https://pypi.org/project/setuptools
  summary: Easily download, build, install, upgrade, and uninstall Python packages

package:
  name: setuptools
  version: 65.6.3
  top-level:
    - _distutils_hack
    - pkg_resources
    - setuptools
source:
  url: https://files.pythonhosted.org/packages/ef/e3/29d6e1a07e8d90ace4a522d9689d03e833b67b50d1588e693eec15f26251/setuptools-65.6.3-py3-none-any.whl
  sha256: 57f6f22bde4e042978bcd50176fdb381d7c21a9efa4041202288d3737a0c6a54
build:
  post: |
    find build/setuptools-*/dist -name '*.exe' -delete
requirements:
  run:
    - distutils
    - pyparsing
about:
  home: https://github.com/pypa/setuptools
  PyPI: https://pypi.org/project/setuptools
  summary: Easily download, build, install, upgrade, and uninstall Python packages
