When doing makesum set MASTER_SITES and DISTFILES that generate a
distinfo containing all supported Python versions vs. all document
formats.

While we're here update distfiles to match the new order (i.e.
_PYTHON_VERSIONS from Uses/python.mk).

PR: 235169
Reviewed by: koobs (python, ports), matthew (mentor)
Approved by: koobs (python, ports), matthew (mentor)
Differential Revision: D19064