Arch Linux has been setting PYTHONHASHSEED=0 to create deterministic
.pyc files.  After a thorough review by the Arch Security Team, setting
this variable was determined not to generated vulnerable .pyc files, as
when the loader loads the .pyc file and unmarshalls it, the internal
runtime will just populate the unordered data structures and use a new
runtime hash for them.

Signed-off-by: Allan McRae <allan@archlinux.org>