Gopher protocol should depend on networking being enabled.

Ok'd by Måns and DonDiego on IRC.

Originally committed as revision 17399 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -1108,6 +1108,7 @@ x11_grab_device_demuxer_deps="x11grab XShmCreateImage"
 x11_grab_device_demuxer_extralibs="-lX11 -lXext"
 
 # protocols
+gopher_protocol_deps="network"
 http_protocol_deps="network"
 rtp_protocol_deps="udp_protocol"
 tcp_protocol_deps="network"