[PATCH] Invoke _dl_arch_map_object if defined

[Roland McGrath]

It's odd to use a macro with a name that looks like a global function,
where it's a macro-specific interface by dint of using #ifdef.  It would be
more normal style to do:

#ifdef DL_AFTER_LOAD
  DL_AFTER_LOAD (l);
#endif

Also, remember space before paren.