tagsetter: use G_DEFINE_INTERFACE_* macro
tagsetter: use G_DEFINE_INTERFACE_* macro

https://bugzilla.gnome.org/show_bug.cgi?id=673641

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