Restore MIPS builds

[Richard Sandiford]

I've applied the patch below to restore -Werror MIPS builds.
Tested on mips64-linux-gnu.

Richard


gcc/
        * config/mips/mips.c (mips_handle_option): Remove unused variable.

Index: gcc/config/mips/mips.c
===================================================================
--- gcc/config/mips/mips.c      2011-05-15 08:37:21.000000000 +0100
+++ gcc/config/mips/mips.c      2011-05-15 08:37:28.000000000 +0100
@@ -15287,7 +15287,6 @@ mips_handle_option (struct gcc_options *
                    location_t loc ATTRIBUTE_UNUSED)
 {
   size_t code = decoded->opt_index;
-  const char *arg = decoded->arg;
 
   switch (code)
     {