Remove mail module's g_module_check_init().

Not needed anymore since all modules are resident nowadays.

modules/mail/evolution-module-mail.c

@@ -71,15 +71,3 @@ e_module_unload (GTypeModule *type_module)
 {
 }
 
-G_MODULE_EXPORT const gchar *
-g_module_check_init (GModule *module)
-{
-	/* FIXME Until mail is split into a module library and a
-	 *       reusable shared library, prevent the module from
-	 *       being unloaded.  Unloading the module resets all
-	 *       static variables, which screws up foo_get_type()
-	 *       functions among other things. */
-	g_module_make_resident (module);
-
-	return NULL;
-}