pluginfeature: Fix the GstPluginFeature name comparison.
pluginfeature: Fix the GstPluginFeature name comparison.

The gst_plugin_feature_rank_compare_func() should return
negative value, if the rank of both PluginFeatures are equal and
the name of first PluginFeature comes before the second one.

https://bugzilla.gnome.org/show_bug.cgi?id=697990

lubosz/gstreamer,krichter722/gstreamer,mparis/gstreamer,collects/gstreamer,krichter722/gstreamer,cablelabs/gstreamer,surround-io/gstreamer,Lachann/gstreamer,jpakkane/gstreamer,centricular/gstreamer,lubosz/gstreamer,lovebug356/gstreamer,krieger-od/gstreamer,Lachann/gstreamer,cfoch/gstreamer,centricular/gstreamer,ensonic/gstreamer,justinjoy/gstreamer,collects/gstreamer,centricular/gstreamer,jpxiong/gstreamer,lubosz/gstreamer,krieger-od/gstreamer,krieger-od/gstreamer,krieger-od/gstreamer,collects/gstreamer,jpxiong/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,justinjoy/gstreamer,jpakkane/gstreamer,lovebug356/gstreamer,krichter722/gstreamer,Lachann/gstreamer,centricular/gstreamer,shelsonjava/gstreamer,cablelabs/gstreamer,Lachann/gstreamer,surround-io/gstreamer,lovebug356/gstreamer,krichter722/gstreamer,cablelabs/gstreamer,lubosz/gstreamer,mparis/gstreamer,surround-io/gstreamer,collects/gstreamer,mparis/gstreamer,ensonic/gstreamer,StreamUtils/gstreamer,justinjoy/gstreamer,collects/gstreamer,cfoch/gstreamer,justinjoy/gstreamer,shelsonjava/gstreamer,ensonic/gstreamer,justinjoy/gstreamer,mparis/gstreamer,cfoch/gstreamer,jpakkane/gstreamer,Lachann/gstreamer,cablelabs/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,lovebug356/gstreamer,ensonic/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,centricular/gstreamer,krieger-od/gstreamer,StreamUtils/gstreamer,jpakkane/gstreamer,shelsonjava/gstreamer,ensonic/gstreamer,surround-io/gstreamer,cfoch/gstreamer,lovebug356/gstreamer,mparis/gstreamer,cablelabs/gstreamer,StreamUtils/gstreamer,jpakkane/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,cfoch/gstreamer,surround-io/gstreamer,lubosz/gstreamer