Remove the "power8" AT_PLATFORM directory

Index: b/releng/glibc_post_upgrade.c
===================================================================
--- a/releng/glibc_post_upgrade.c
+++ b/releng/glibc_post_upgrade.c
@@ -73,14 +73,23 @@ main (void)
   int i, j, fd;
   off_t base;
   ssize_t ret;
+  const char *remove_dirs[] = {
 #ifdef __i386__
-  const char *remove_dirs[] = { "/lib/tls", "/lib/i686", "/lib/tls/i486", "/lib/tls/i586", "/lib/tls/i686" };
-#else
-#ifndef LIBTLS
-#define LIBTLS "/lib/tls"
-#endif
-  const char *remove_dirs[] = { LIBTLS };
-#endif
+    "/lib/tls", "/lib/i686", "/lib/tls/i486", "/lib/tls/i586", "/lib/tls/i686"
+#else /* !__i386__ */
+# ifndef LIBTLS
+#  define LIBTLS "/lib/tls"
+# endif
+# if defined (__powerpc64__)
+    /* Covers both big endian and little endian.  */
+    "/lib64/power8",
+# elif defined (__powerpc__)
+    /* Covers 32-bit only (because of the previous conditional).  */
+    "/lib/power8",
+# endif
+    LIBTLS
+#endif /* !__i386__ */
+  };
   for (j = 0; j < sizeof (remove_dirs) / sizeof (remove_dirs[0]); ++j)
     {
       size_t rmlen = strlen (remove_dirs[j]);