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/libsamplerate/default.nix

@@ -1,6 +1,6 @@
-{ stdenv, fetchurl, multipleOutputs, pkgconfig, libsndfile }:
+{ stdenv, fetchurl, pkgconfig, libsndfile }:
 
-multipleOutputs rec {
+stdenv.mkDerivation rec {
   name = "libsamplerate-0.1.7";
 
   src = fetchurl {