build: Only run make check-exports if no public API was disabled
build: Only run make check-exports if no public API was disabled

Fixes bug #598297.

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