www/py-django*: Fix build (extract) with static bsdtar(1)

> Extracting for py37-django22-2.2.19

> SHA256 Checksum OK for python/Django-2.2.19.tar.gz.

tar: Pathname can't be converted from UTF-8 to current locale.
tar: Error exit delayed from previous errors.

> Failed to extract "/portdistfiles/python/Django-2.2.19.tar.gz".

• Error code 1

See more details for the same issue in bug 246618 and
https://portsfallout.com/fallout?port=www%2Fpy-django

Reported by: pkg-fallout
Approved by: portmgr blanket