epdfview: disable cups

* we usually don't want cups in target images, but cups was sometimes
  autodetected and compilation failed
* | PrintPter.cxx:19:23: fatal error: cups/cups.h: No such file or directory
  Under the SHR distribution for the nokia900 machine(and maybe all other machines)

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>