unassigning cntl-Z in cua mode

[Stuart McGraw]

Hello all,

I have recently started using CUA mode and it is ok except for
one thing... I don't like having cntl-z mapped to undo.  I run
emacs in a terminal window (emacs -nw) a lot and routinely need
to suspend emacs with cntl-z, do something in the shell, then
resume emacs.

How can I undo the mapping the CUA mode applies to the cntl-z
key?  I am elisp-illiterate so a cut and paste solution would
be greatly appreciated.

Emacs 24.4 on Fedora 21 if it matters.  Thanks much...