Include compatability defines for old versions of libxml1
Include compatability defines for old versions of libxml1

Original commit message from CVS:
Include compatability defines for old versions of libxml1

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