Currently, lang/python38 and lang/python39 are not respecting
DISABLED_EXTENSIONS variable because patch-issue20210 was removed when
lang/python38 was added to the ports tree.
When building with poudriere we don't see any issues because it's built
on a clean env.
patch-issue20210 is still present on lang/python36 and lang/python37.
Support for *disabled* marker in Setup files was introduced in Python
3.7, so backport this fix to it to keep consistency in the ports tree.
Patch based in all reports.
PR: 243358 [1]
PR: 243937 [2]
Reported by: ngie [1]
Reported by: jcfyecrayz@liamekaens.com [2]
Reported by: tuxillo (IRC) DPorts