Revert "[entropy.client.package] synchronize text output calls to avoid garbled output"

This reverts commit e722455432317516235e56fb386a60f05d237804.
[entropy.output] sychronize writes to stdout/stderr to avoid garbled output

In a multithreaded scenario, text may get garbled if there is no
synchronization between threads wrt the shared resources (std{out,err}).
This happens even when stdio buffering is enabled, of course.