libgnomecanvas: fix QA warnings from packaging

* fixes:
libgnomecanvas-2.26.0: non -staticdev package contains static .a library: libgnomecanvas-dev path '/work/armv7a-vfp-neon-oe-linux-gnueabi/libgnomecanvas/2.26.0-r0/packages-split/libgnomecanvas-dev/usr/lib/libglade/2.0/libcanvas.a'

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>