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- [x] Add new / update outdated documentation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: xlrd
  version: 2.0.1
  top-level:
    - xlrd
source:
  sha256: 6a33ee89877bd9abc1158129f6e94be74e2679636b8a205b43b85206c3f0bbdd
  url: https://files.pythonhosted.org/packages/a6/0c/c2a72d51fe56e08a08acc85d13013558a2d793028ae7385448a6ccdfae64/xlrd-2.0.1-py2.py3-none-any.whl
about:
  home: http://www.python-excel.org/
  PyPI: https://pypi.org/project/xlrd
  summary:
    Library for developers to extract data from Microsoft Excel (tm) .xls spreadsheet
    files
  license: BSD

package:
  name: xlrd
  version: 2.0.1
  top-level:
    - xlrd
source:
  sha256: 6a33ee89877bd9abc1158129f6e94be74e2679636b8a205b43b85206c3f0bbdd
  url: https://files.pythonhosted.org/packages/a6/0c/c2a72d51fe56e08a08acc85d13013558a2d793028ae7385448a6ccdfae64/xlrd-2.0.1-py2.py3-none-any.whl
about:
  home: http://www.python-excel.org/
  PyPI: https://pypi.org/project/xlrd
  summary:
    Library for developers to extract data from Microsoft Excel (tm) .xls spreadsheet
    files
  license: BSD
