pip3 install pyqt5 fails on aarch64

[bhlevca]

**Environment :

OS: [debian aarch64]
Python [ 3.7.3]
PyQt5 [5.16]

Describe the bug or Expected behaviour ,

command pip3 install pyqt5 fails

Additional context and Screenshots

pip3 install pyqt5
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting pyqt5
Using cached https://files.pythonhosted.org/packages/3b/27/fd81188a35f37be9b3b4c2db1654d9439d1418823916fe702ac3658c9c41/PyQt5-5.15.6.tar.gz
Installing build dependencies ... done
Complete output from command python setup.py egg_info:
Traceback (most recent call last):
File "", line 1, in
File "/usr/lib/python3.7/tokenize.py", line 447, in open
buffer = _builtin_open(filename, 'rb')
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/pip-install-7g0eq6ep/pyqt5/setup.py'

----------------------------------------

Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-7g0eq6ep/pyqt5/

Aarch64  packages which have pip dependencies on pyqt5 fail.

I installed pyqt5 with apt and then I removed pyqt5 from the list of required packages so that pip3 does not crash at build time.
However, the solution I proposed above for the aarch64 packages that have a pyqt5 dependency with pip is a temporary hack.

The real solution is to add PyQt5-5.15.6-cp36-abi3-manylinux1_aarch64.whl at https://pypi.org/project/PyQt5/#files