component/webp: build will everything

(includeing webpdemux that's needed for webkit)

component/webp/buildout.cfg

@@ -19,6 +19,7 @@ configure-options =
   --disable-static
   --disable-gl
   --disable-wic
+  --enable-everything
   --with-jpegincludedir=${libjpeg:location}/include
   --with-jpeglibdir=${libjpeg:location}/lib
   --with-tiffincludedir=${libtiff:location}/include