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Due to a Safari bug, in some browser, two csrftoken cookies with different values
exist: one unpartitioned, one partitioned ("CHIPS"). This function generates an
additional Set-Cookie header to get rid of the unpartitioned one.
As Django usually only allows one Set-Cookie header per cookie name, we
need to manually create a cookie 'Morsel' for the deletion and store it
in the HttpResponse's cookie dictionary under a different name, so it is
not overwritten by the actual, correct Set-Cookie header. This works
because the code in django.core.handlers.wsgi/asgi, that generates the
actual Set-Cookie headers, only iterates over cookie.values(), ignoring
the keys.