rtti.c change breaks Solaris x86

[John Carr]

This recent change breaks Solaris x86 g++:

	* rtti.c (get_tinfo_fn): Also set DECL_IGNORED_P.

It triggers this abort in dwarfout_file_scope_decl when compiling tinfo.cc
on Solaris x86 (i386-pc-solaris2.6):

  if (DECL_IGNORED_P (decl))
    {
      if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl) != NULL)
	abort ();
      return;
    }