libwebp soname bump

[Sandro Mani]

Hi,

I've just updated libwebp in rawhide, which involves a soname bump. 
Dependencies are

ImageMagick-6.8.7.0-2.fc21.src.rpm
SDL2_image-2.0.0-3.fc21.src.rpm
dmapd-0.0.55-5.fc21.src.rpm
gdal-1.10.1-2.fc21.src.rpm
gthumb-3.2.5-2.fc21.src.rpm
kde-runtime-4.12.0-1.fc21.src.rpm
leptonica-1.69-10.fc20.src.rpm
libwebp-0.3.1-2.fc21.src.rpm
nip2-7.36.5-1.fc21.src.rpm
python-pillow-2.2.1-2.fc21.src.rpm
python-webm-0.2.2-2.fc20.src.rpm
qt5-qtwebkit-5.2.0-1.fc21.src.rpm
qtwebkit-2.3.3-3.fc21.src.rpm
vips-7.36.5-1.fc21.src.rpm
webkitgtk-2.2.3-1.fc21.src.rpm
webkitgtk3-2.3.3-1.fc21.src.rpm

I'll take care of python-pillow.

Thanks,
Sandro