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- [x] Add new / update outdated documentation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: click
  version: 8.1.3
source:
  url: https://files.pythonhosted.org/packages/c2/f1/df59e28c642d583f7dacffb1e0965d0e00b218e0186d7858ac5233dce840/click-8.1.3-py3-none-any.whl
  sha256: bb4d8133cb15a609f44e8213d9b391b0809795062913b383c62be0ee95b1db48
test:
  imports:
    - click
about:
  home: https://palletsprojects.com/p/click/
  PyPI: https://pypi.org/project/click
  summary: Composable command line interface toolkit
  license: BSD-3-Clause

package:
  name: click
  version: 8.1.3
source:
  url: https://files.pythonhosted.org/packages/c2/f1/df59e28c642d583f7dacffb1e0965d0e00b218e0186d7858ac5233dce840/click-8.1.3-py3-none-any.whl
  sha256: bb4d8133cb15a609f44e8213d9b391b0809795062913b383c62be0ee95b1db48
test:
  imports:
    - click
about:
  home: https://palletsprojects.com/p/click/
  PyPI: https://pypi.org/project/click
  summary: Composable command line interface toolkit
  license: BSD-3-Clause
