comment out unused caps_changed related functions and prototypes
comment out unused caps_changed related functions and prototypes

Original commit message from CVS:
comment out unused caps_changed related functions and prototypes

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