In 9d03ff5222 I made the CPython builds
reproducible. This required not generating default unoptimized bytecode.
I was under the impression the optimized bytecode would be used then,
but you need to opt-in on that. Not having the default bytecode resulted
in a significant performance hit. Therefore, bytecode is generated again
in this commit, and thereby the builds are no longer reproducible.
https://bugs.python.org/issue29708
(cherry picked from commit 23e348bfe2b161e761dd37e3be86a807f3cd6f94)
c32a9d4158