less verbose Kivy startup (#6743)
less verbose Kivy startup (#6743)

if using xclip, even if the Kivy logger is set to log_level='warning' only, Kivy startup always displays just this:
   xclip version 0.13
   Copyright (C) 2001-2008 Kim Saunders et al.
   Distributed under the terms of the GNU GPL

This is due to using 'xclip -version' (otherwise, without -version it would block)

SOLUTION: by ignoring this informative xclip stderr we get a cleaner Kivy startup and still except when xclip is not present
rnixx/kivy,matham/kivy,matham/kivy,akshayaurora/kivy,rnixx/kivy,matham/kivy,akshayaurora/kivy,inclement/kivy,inclement/kivy,inclement/kivy,akshayaurora/kivy,kivy/kivy,rnixx/kivy,matham/kivy,kivy/kivy,kivy/kivy