lame: split into multiple outputs, slightly unusually

Here it seemed that the library doesn't belong into $out,
so I left most in $out and separated $lib (and $doc).

pkgs/development/libraries/lame/default.nix

···
 
   patches = [ ./gcc-4.9.patch ];
 
+  outputs = [ "out" "lib" "doc" ]; # a small single header
+  outputMan = "out";
+
   nativeBuildInputs = [ ]
     ++ optional nasmSupport nasm;