Added gst_buffer[_pool]_needs_copy_on_write()
Added gst_buffer[_pool]_needs_copy_on_write()

Original commit message from CVS:
Added gst_buffer[_pool]_needs_copy_on_write()

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