ffmpeg: split into multiple outputs

Also fix some referrers.

pkgs/development/libraries/ffmpeg/generic.nix

@@ -67,6 +67,10 @@ stdenv.mkDerivation rec {
 
   patchPhase = ''patchShebangs .'';
 
+  outputs = [ "dev" "out" "bin" ]
+    ++ optional (reqMin "1.0") "doc" ; # just dev-doc
+  setOutputFlags = false; # doesn't accept all and stores configureFlags in libs!
+
   configureFlags = [
     # License
       "--enable-gpl"
@@ -145,6 +149,11 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
+  postFixup = ''
+    _moveToOutput bin "$bin"
+    _moveToOutput share/ffmpeg/examples "$doc"
+  '';
+
   /* Cross-compilation is untested, consider this an outline, more work
      needs to be done to portions of the build to get it to work correctly */
   crossAttrs = let