Disable universal wheels

We can't build universal wheels of WSME because they end up with the
wrong dependency list, which ends up causing WSME to try to install
ipaddr under python 3 where it is (a) not needed and (b) can't be
installed because of a syntax error.

Change-Id: Ia7f6cb4cad9bb8cb58a6004ab2a394584e2e9efd