configure: always call our check checks for the SUBUNIT conditional
configure: always call our check checks for the SUBUNIT conditional

The SUBUNIT conditional needs to be set even if check is disabled. Also
remove a FIXME that is not needed any longer / after all.

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