PowerPC: Fix optimized strncat strlen call

This patch fixes the optimized ppc64/power7 strncat strlen call for
static build without ifunc enabled.  The strlen symbol to call in such
situation is just strlen, instead of __GI_strlen (since the __GI_
alias is just created for shared objects).

ChangeLog

@@ -1,3 +1,8 @@
+2014-06-06  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
+
+	* sysdeps/powerpc/powerpc64/power7/strncat.S [STRLEN]: Define it as
+	strlen for non SHARED builds.
+
 2014-06-05  Siddhesh Poyarekar  <siddhesh@redhat.com>
 
 	* nptl/allocatestack.c (check_list): Inlined function...

sysdeps/powerpc/powerpc64/power7/strncat.S

@@ -40,7 +40,11 @@
 #ifndef STRLEN
 /* For builds with no IFUNC support, local calls should be made to internal
    GLIBC symbol (created by libc_hidden_builtin_def).  */
-# define STRLEN   __GI_strlen
+# ifdef SHARED
+#  define STRLEN   __GI_strlen
+# else
+#  define STRLEN   strlen
+# endif
 #endif
 
 #define	FRAMESIZE	(FRAME_MIN_SIZE+32)