Turn multipleOutputs into a stdenv adaptation

This way we can merge it into stdenv.mkDerivation later without having
to modify any package expressions (except the overrides in
all-packages.nix).

pkgs/development/libraries/libsndfile/default.nix

@@ -1,6 +1,6 @@
-{ stdenv, fetchurl, multipleOutputs, flac, libogg, libvorbis, pkgconfig }:
+{ stdenv, fetchurl, flac, libogg, libvorbis, pkgconfig }:
 
-multipleOutputs rec {
+stdenv.mkDerivation rec {
   name = "libsndfile-1.0.23";
 
   src = fetchurl {