glib-networking: split the dev output

That's done to get rid of propagatedBuildInputs from regular closure.
Also references were fixed, mainly to its gio modules.

pkgs/applications/networking/browsers/vimb/default.nix

@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
 
   preFixup = ''
     wrapProgram "$out/bin/vimb" \
-      --prefix GIO_EXTRA_MODULES : "${glib_networking}/lib/gio/modules" \
+      --prefix GIO_EXTRA_MODULES : "${glib_networking.out}/lib/gio/modules" \
       --prefix XDG_DATA_DIRS : "$GSETTINGS_SCHEMAS_PATH"
   '';