Fix build on 8.x and 9.x.
games/pysolfc: switch from py-imaging to py-pillow

- USES python

With hat:	python
Approved by:	portmgr (bdrewery, implicit)
Update to 1.6.10
Define LICENSE

PR:		194181
net-im/pwytter: switch from py-imaging to py-pillow

- USES python

With hat:	python
Approved by:	portmgr (bdrewery, implicit)
math/asymptote: switch from py-imaging to py-pillow

- USES python

With hat:	python
Approved by:	portmgr (bdrewery, implicit)