[manylinux2014] CPython 3.9.0b5 → 3.9.0rc1

[manselmi]

Changelog: https://docs.python.org/3.9/whatsnew/3.9.html

[manselmi]

Looks like Travis builds are erroring out in strange ways again. The first build had all jobs pass except for ppc64le: https://travis-ci.org/github/pypa/manylinux/builds/717071475

Error message:

No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.

Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#build-times-out-because-no-output-was-received

The build has been terminated

The ppc64le job errored out in the same way in the second build: https://travis-ci.org/github/pypa/manylinux/builds/717109961

I can keep retrying, but if this keeps happening it'd be great to merge the PR anyway if we feel confident that it looks okay.

[manselmi]

@auvipy Thanks for approving and merging the manylinux1 and manylinux2010 PRs. Travis builds for ppc64le have stalled three times in a row now, and I don’t want to keep rerunning and waste Travis resources. What should be done here?

[manselmi]

@auvipy Thank you!