[RS6000] Revert rs6000_opt_vars change

Doubly wrong.  Broke AIX bootstrap, and not updated for the
change in name.

	* config/rs6000/rs6000.c (rs6000_opt_vars): Revert last change.

From-SVN: r240639

gcc/ChangeLog

+2016-09-30  Alan Modra  <amodra@gmail.com>
+
+	* config/rs6000/rs6000.c (rs6000_opt_vars): Revert last change.
+
 2016-09-29  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/driver-i386.c (host_detect_local_cpu): Check maximum

gcc/config/rs6000/rs6000.c

@@ -37129,9 +37129,6 @@ static struct rs6000_opt_var const rs6000_opt_vars[] =
   { "warn-cell-microcode",
     offsetof (struct gcc_options, x_rs6000_warn_cell_microcode),
     offsetof (struct cl_target_option, x_rs6000_warn_cell_microcode), },
-  { "gnu-attr",
-    offsetof (struct gcc_options, x_rs6000_gnu_attr),
-    offsetof (struct cl_target_option, x_rs6000_gnu_attr), },
 };
 
 /* Inner function to handle attribute((target("..."))) and #pragma GCC target