node: remove redundant --use-old-buffer

Accidentally left when upgrading to V8 4.4.63.9

PR-URL: #2275
Reviewed-By: Michaël Zasso <mic.besace@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

Author: rvagg

src/node.cc

@@ -3106,10 +3106,9 @@ static void PrintHelp() {
          "  --track-heap-objects  track heap object allocations for heap "
          "snapshots\n"
          "  --v8-options          print v8 command line options\n"
-         "  --use-old-buffer      Revert to old Buffer implementation\n"
 #if defined(NODE_HAVE_I18N_SUPPORT)
          "  --icu-data-dir=dir    set ICU data load path to dir\n"
-         "                          (overrides NODE_ICU_DATA)\n"
+         "                        (overrides NODE_ICU_DATA)\n"
 #if !defined(NODE_HAVE_SMALL_ICU)
          "                        Note: linked-in ICU data is\n"
          "                        present.\n"