Add Python 3.8 Wheels

[thewtex]

:xref: InsightSoftwareConsortium/ITK#552

[jcfr]

• manylinux base image update to include Python 3.8
  • PR submitted . See Add Python 3.8.0a2 pypa/manylinux#273
  • PR integrated into https://github.com/pypa/manylinux
  • new image published and available. See https://quay.io/repository/pypa/manylinux1_x86_64

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• Update of dockcross manylinux images to include Python 3.8.
  • Submit PR. See manylinux: Trigger rebuild using updated manylinux images having Python 3.8 dockcross/dockcross#306
  • Updated docker images are available

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• Update cmake-python-distributions to distribute Python 3.8 wheels. See Add Python 3.8 wheels cmake-python-distributions#63 Instead of generation 3.8 wheels, the wheel are convert to platform generic ones that are independent from python ABI. See Generate wheels without python ABI cmake-python-distributions#71

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• Update of ninja-python-distributions CI configuration. See Python 3.8 wheels #21

[thewtex]

Updated manylinux dockcross images are now available!

• dockcross/dockcross@227d07f
• https://hub.docker.com/r/dockcross/manylinux-x64/tags

[jcfr]

Closing. ABI independent wheels are being generated, see #21 (comment)