Merge #1901: add preFixupPhases to stdenv; for gsettings

Without this stdenv change it seems difficult to fix some glib's gsettings issues,
as the folders in question may (not) be created in installPhase.

pkgs/development/libraries/glib/default.nix

@@ -48,6 +48,8 @@ stdenv.mkDerivation rec {
     sha256 = "1d98mbqjmc34s8095lkw1j1bwvnnkw9581yfvjaikjvfjsaz29qd";
   };
 
+  setupHook = ./setup-hook.sh;
+
   buildInputs = [ libelf ]
     ++ optionals doCheck [ tzdata libxml2 desktop_file_utils shared_mime_info ];