[MacPorts] #59886: Consider re-enabling HAVE_POLL in python

[MacPorts]

#59886: Consider re-enabling HAVE_POLL in python
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 Reporter:  grimreaper  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  python python36 python37
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 In https://trac.macports.org/ticket/18376 we disabled poll(2) for python
 due to bugs in apple's implementation. As far as I could tell:

 1) Poll is no longer disabled in any fix file in modern mac versions
 https://opensource.apple.com/source/python/python-109.200.2/2.7/fix/
 2) The buggy version of poll was fixed
 ∴./a.out
 poll() works
 ∴sw_vers
 ProductName:    Mac OS X
 ProductVersion: 10.14.6
 BuildVersion:   18G2022

 3) and has worked since at least 10.12.2:
 https://github.com/curl/curl/issues/1057#issuecomment-271866997


 Further some python software explicitly looks for "PollSelector" instead
 of relying on the default.

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Ticket URL: <https://trac.macports.org/ticket/59886>
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