Default to -msecure-plt

Index: gcc/config/rs6000/openbsd.h
--- gcc/config/rs6000/openbsd.h.orig
+++ gcc/config/rs6000/openbsd.h
@@ -131,3 +131,8 @@ Boston, MA 02111-1307, USA.  */
 #undef TRAMPOLINE_SIZE
 #define TRAMPOLINE_SIZE 40
 
+#undef TARGET_SECURE_PLT                                                                                                                                                                                                                  
+#define TARGET_SECURE_PLT	secure_plt
+
+#undef CC1_SECURE_PLT_DEFAULT_SPEC
+#define CC1_SECURE_PLT_DEFAULT_SPEC "-msecure-plt"