Enable threading by default, do not always link against libgthread
Enable threading by default, do not always link against libgthread

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