datetime: remove fallback code for old GLibs
datetime: remove fallback code for old GLibs

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