libwmf: fix QA warnings

* fixes:
libwmf-0.2.8.4: non -staticdev package contains static .a library: libwmf-dev path '/work/armv4t-oe-linux-gnueabi/libwmf/0.2.8.4-r2/packages-split/libwmf-dev/usr/lib/gtk-2.0/2.10.0/loaders/io-wmf.a'

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