Don't add readline to binary packages.

This can break binary packages since Python dependencies with a binary
component (readline being the only one) are named with the target
platform in their name.
Revert "[PTFM-6985] Change default # threads inside EE to 8"

This reverts commit e4e6fa19dbd660aad9aa401bd716f8e81dca1962.

We will tune the number of threads more carefully to avoid running components out of memory.
Changelog update for v0.44.3
[PTFM-6985] Change default size of dxfile HTTP threadpool inside EE to 8, chunk size 128 to 64M
Changelog update for v0.44.4