skype: fix rpath broken by closure-size merge

pkgs/applications/networking/instant-messengers/skype/default.nix

@@ -38,13 +38,8 @@ stdenv.mkDerivation rec {
     mkdir -p $out/{libexec/skype/,bin}
     cp -r * $out/libexec/skype/
 
-    fullPath=
-    for i in $nativeBuildInputs; do
-      fullPath=$fullPath''${fullPath:+:}$i/lib
-    done
-
     patchelf --interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
-        --set-rpath "$fullPath" $out/libexec/skype/skype
+        --set-rpath "${lib.makeLibraryPath buildInputs}" $out/libexec/skype/skype
 
     cat > $out/bin/skype << EOF
     #!${stdenv.shell}