reference: pygtk-gtkcurve.xml: change the warning into a deprecation warning
reference: pygtk-gtkcurve.xml: change the warning into a deprecation warning

Distrotech/pygtk,nzjrs/pygtk,GNOME/pygtk,GNOME/pygtk,nzjrs/pygtk,GNOME/pygtk,nzjrs/pygtk,Distrotech/pygtk,amremam2004/pygtk,amremam2004/pygtk,Distrotech/pygtk,amremam2004/pygtk