configure: check for sys/poll.h
configure: check for sys/poll.h

https://bugzilla.gnome.org/show_bug.cgi?id=667286

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