make libs use same gtk-doc.mak
make libs use same gtk-doc.mak

Original commit message from CVS:
make libs use same gtk-doc.mak

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