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- [x] Add new / update outdated documentation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: typing-extensions
  version: 4.4.0
  top-level:
    - typing_extensions
source:
  url: https://files.pythonhosted.org/packages/0b/8e/f1a0a5a76cfef77e1eb6004cb49e5f8d72634da638420b9ea492ce8305e8/typing_extensions-4.4.0-py3-none-any.whl
  sha256: 16fa4864408f655d35ec496218b85f79b3437c829e93320c7c9215ccfd92489e

package:
  name: typing-extensions
  version: 4.4.0
  top-level:
    - typing_extensions
source:
  url: https://files.pythonhosted.org/packages/0b/8e/f1a0a5a76cfef77e1eb6004cb49e5f8d72634da638420b9ea492ce8305e8/typing_extensions-4.4.0-py3-none-any.whl
  sha256: 16fa4864408f655d35ec496218b85f79b3437c829e93320c7c9215ccfd92489e
