gobject-introspection: rename package

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

pkgs/applications/misc/pdfpc/default.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub, cmake, makeWrapper, pkgconfig, vala, gtk3, libgee
-, poppler, libpthreadstubs, gstreamer, gst-plugins-base, librsvg, pcre, gobjectIntrospection }:
+, poppler, libpthreadstubs, gstreamer, gst-plugins-base, librsvg, pcre, gobject-introspection }:
 
 stdenv.mkDerivation rec {
   name = "${product}-${version}";
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [
     cmake pkgconfig vala
     # For setup hook
-    gobjectIntrospection
+    gobject-introspection
   ];
   buildInputs = [ gstreamer gst-plugins-base gtk3 libgee poppler
     libpthreadstubs makeWrapper librsvg pcre ];