check: add dependency on gstcheck header files for exports.sym
check: add dependency on gstcheck header files for exports.sym

So exports.sym gets updated correctly, and our new symbols get
exported correctly, which makes g-ir-scanner much happier in
terms of linking.

https://bugzilla.gnome.org/show_bug.cgi?id=683012

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