gobject-introspection: rename package

camelCase package name was a huge inconsistency in GNOME package set.

pkgs/development/libraries/libnotify/default.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchurl, pkgconfig, autoreconfHook
-, glib, gdk_pixbuf, gobjectIntrospection }:
+, glib, gdk_pixbuf, gobject-introspection }:
 
 stdenv.mkDerivation rec {
   ver_maj = "0.7";
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   # disable tests as we don't need to depend on gtk+(2/3)
   configureFlags = [ "--disable-tests" ];
 
-  nativeBuildInputs = [ pkgconfig autoreconfHook gobjectIntrospection ];
+  nativeBuildInputs = [ pkgconfig autoreconfHook gobject-introspection ];
   buildInputs = [ glib gdk_pixbuf ];
 
   meta = with stdenv.lib; {