Don't use select() in interactive python shell

This fixes the python interactive shell when running under
sel_ldr (in this case select() will always return ENOSYS
which python doesn't handle and we end up an infinite loop).

This wasn't a problem in the past since we didn't include
nacl_io on the link line, and hence python didn't compile
with select() support.

R=bradnelson@google.com

Review URL: https://codereview.chromium.org/1066763002
2 files changed