core: Drop old GLIB_CHECK_VERSION(2.32) bits

We hard require 2.34 now; if it doesn't exist on the system, that's
what embedded dependencies are for.

src/libotutil/ot-variant-utils.c

@@ -92,13 +92,7 @@ ot_util_variant_save (GFile *dest,
 GVariant *
 ot_util_variant_take_ref (GVariant *variant)
 {
-#if GLIB_CHECK_VERSION(2,32,0) && !defined(OSTREE_GLIB_TARGET_MIN)
   return g_variant_take_ref (variant);
-#else
-  if (g_variant_is_floating (variant))
-    return g_variant_ref_sink (variant);
-  return variant;
-#endif
 }
 
 /**