Expected behaviour

Pylint was previously able to inspect cv2 member existence with the extension-pkg-whitelist parameter.

Actual behaviour

For opencv-python-4.5.4.58, pylint can no longer inspect the members.

Steps to reproduce

On Windows 10, Python 3.8 64bit, using Pylint 2.11.1:

"""Test module test.py"""
from cv2 import getStructuringElement, MORPH_ELLIPSE

a = getStructuringElement(MORPH_ELLIPSE, (3, 3))

With opencv-python-4.5.3.56:

$ pylint test.py --extension-pkg-whitelist=cv2

-------------------------------------------------------------------
Your code has been rated at 10.00/10 (previous run: 5.00/10, +5.00)

With opencv-python-4.5.4.58:

$ pylint test.py --extension-pkg-whitelist=cv2
************* Module test
test.py:2:0: E0611: No name 'getStructuringElement' in module 'cv2' (no-name-in-module)
test.py:2:0: E0611: No name 'MORPH_ELLIPSE' in module 'cv2' (no-name-in-module)

----------------------------------------------------------------------
Your code has been rated at -40.00/10 (previous run: 10.00/10, -50.00)

Issue submission checklist

• This is not a generic OpenCV usage question (looking for help for coding, other usage questions, homework etc.)
• I have read the README of this repository and understand that this repository provides only an automated build toolchain for OpenCV Python packages (there is no actual OpenCV code here)
• The issue is related to the build scripts in this repository, to the pre-built binaries or is a feature request (such as "please enable this additional dependency")
• I'm using the latest version of opencv-python