added check for version 1.8.1 or better of libxml
added check for version 1.8.1 or better of libxml

Original commit message from CVS:
added check for version 1.8.1 or better of libxml

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