run gstreamer-register on postinstall
run gstreamer-register on postinstall

Original commit message from CVS:
run gstreamer-register on postinstall

justinjoy/gstreamer,lovebug356/gstreamer,centricular/gstreamer,mrchapp/gstreamer,ylatuya/gstreamer,mparis/gstreamer,lubosz/gstreamer,krieger-od/gstreamer,cablelabs/gstreamer,shelsonjava/gstreamer,Distrotech/gstreamer,justinjoy/gstreamer,centricular/gstreamer,justinjoy/gstreamer,mrchapp/gstreamer,StreamUtils/gstreamer,magcius/gstreamer,magcius/gstreamer,mparis/gstreamer,cfoch/gstreamer,StreamUtils/gstreamer,cablelabs/gstreamer,krieger-od/gstreamer,cablelabs/gstreamer,magcius/gstreamer,Lachann/gstreamer,magcius/gstreamer,lovebug356/gstreamer,shelsonjava/gstreamer,lovebug356/gstreamer,ylatuya/gstreamer,krichter722/gstreamer,ensonic/gstreamer,shelsonjava/gstreamer,krichter722/gstreamer,collects/gstreamer,lovebug356/gstreamer,Distrotech/gstreamer,centricular/gstreamer,jpxiong/gstreamer,jpakkane/gstreamer,Lachann/gstreamer,ensonic/gstreamer,cfoch/gstreamer,mparis/gstreamer,krieger-od/gstreamer,cfoch/gstreamer,mrchapp/gstreamer,lubosz/gstreamer,ahmedammar/platform_external_gst_gstreamer,collects/gstreamer,cablelabs/gstreamer,ahmedammar/platform_external_gst_gstreamer,ensonic/gstreamer,ensonic/gstreamer,mparis/gstreamer,justinjoy/gstreamer,Distrotech/gstreamer,ensonic/gstreamer,jpakkane/gstreamer,StreamUtils/gstreamer,surround-io/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,ylatuya/gstreamer,drothlis/gstreamer,magcius/gstreamer,centricular/gstreamer,ahmedammar/platform_external_gst_gstreamer,Lachann/gstreamer,Lachann/gstreamer,jpxiong/gstreamer,collects/gstreamer,ahmedammar/platform_external_gst_gstreamer,krichter722/gstreamer,lubosz/gstreamer,drothlis/gstreamer,krieger-od/gstreamer,collects/gstreamer,lubosz/gstreamer,krieger-od/gstreamer,mparis/gstreamer,ylatuya/gstreamer,cablelabs/gstreamer,StreamUtils/gstreamer,ahmedammar/platform_external_gst_gstreamer,lovebug356/gstreamer,surround-io/gstreamer,krichter722/gstreamer,surround-io/gstreamer,jpxiong/gstreamer,jpakkane/gstreamer,ylatuya/gstreamer,Distrotech/gstreamer,cfoch/gstreamer,jpakkane/gstreamer,Distrotech/gstreamer,Lachann/gstreamer,drothlis/gstreamer,drothlis/gstreamer,drothlis/gstreamer,krichter722/gstreamer,surround-io/gstreamer,cfoch/gstreamer,mrchapp/gstreamer,jpxiong/gstreamer,jpxiong/gstreamer,lubosz/gstreamer,jpakkane/gstreamer,collects/gstreamer,mrchapp/gstreamer,shelsonjava/gstreamer,surround-io/gstreamer,shelsonjava/gstreamer,justinjoy/gstreamer