tests: Do not list libgstcheck as a requirement for tests/examples/manual
tests: Do not list libgstcheck as a requirement for tests/examples/manual

Fixes bug #601669.

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