Binutils fails to build for arm-none-eabi due to gcc warning and -Werror.

diff -Naur binutils-2.20.orig/gas/config/tc-arm.c binutils-2.20/gas/config/tc-arm.c
--- binutils-2.20.orig/gas/config/tc-arm.c	2009-08-30 07:10:59.000000000 +0900
+++ binutils-2.20/gas/config/tc-arm.c	2009-10-18 12:30:59.711116684 +0900
@@ -2486,7 +2486,9 @@
       frag->tc_frag_data.first_map = symbolP;
     }
   if (frag->tc_frag_data.last_map != NULL)
-    know (S_GET_VALUE (frag->tc_frag_data.last_map) < S_GET_VALUE (symbolP));
+    {
+      know (S_GET_VALUE (frag->tc_frag_data.last_map) < S_GET_VALUE (symbolP));
+    }
   frag->tc_frag_data.last_map = symbolP;
 }