autogen.sh: Enable --enable-gtk-doc for ds
autogen.sh: Enable --enable-gtk-doc for ds

mojaves/orc,okuoku/nmosh-orc,Distrotech/orc,ahmedammar/platform_external_gst_liborc,ahmedammar/platform_external_gst_liborc,mojaves/orc,MOXfiles/orc,okuoku/nmosh-orc,ijsf/OpenWebRTC-orc,mojaves/orc,Distrotech/orc,okuoku/nmosh-orc,MOXfiles/orc,ijsf/OpenWebRTC-orc,ijsf/OpenWebRTC-orc,jpakkane/orc,jpakkane/orc,MOXfiles/orc,jpakkane/orc,Distrotech/orc