Add explicit check for <artsc.h>, in case artsc-config lies to us.
Add explicit check for <artsc.h>, in case artsc-config lies to us.

Original commit message from CVS:
Add explicit check for <artsc.h>, in case artsc-config lies to us.

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