gstcompat: fix backwards compat macro for gst_message_new_duration
gstcompat: fix backwards compat macro for gst_message_new_duration

Name it properly, so it, like, works. Clearly no one actually
used that..

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