make GST_CONFIG_DIR work with sysconfdir
make GST_CONFIG_DIR work with sysconfdir

Original commit message from CVS:
make GST_CONFIG_DIR work with sysconfdir

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