* geos: Fix config issues with python bindings using python3 (#23479)
This should fix some config issues when building geos with python
bindings and using python3 --- the geos configuration scripts had
a few python2-isms.
I only tested (lightly; geos built and I can import geos in python3)
on 3.8.1, but I did check that the patch can at least be applied
in 3.5.
I belatedly discovered that geos dropped all the SWIG bindings
in @3.9, so I also added some conflicts on the +python and +ruby
options to note that they are not supported in 3.9.
* geos: adding omitted patch file
5a7c339b0c