Delete rs6000-nat.c:fixup_breakpoints extern declaration.

This function does not exist...

gdb/ChangeLog:

        * rs6000-nat.c (fixup_breakpoints): Delete declaration.

gdb/ChangeLog

@@ -1,3 +1,7 @@
+2013-03-25  Joel Brobecker  <brobecker@adacore.com>
+
+	* rs6000-nat.c (fixup_breakpoints): Delete declaration.
+
 2013-03-25  Doug Evans  <dje@google.com>
 
 	* contrib/cc-with-tweaks.sh: Check exit code of dwp.

gdb/rs6000-nat.c

@@ -132,8 +132,6 @@ static void vmap_symtab (struct vmap *);
 
 static void exec_one_dummy_insn (struct regcache *);
 
-extern void fixup_breakpoints (CORE_ADDR low, CORE_ADDR high, CORE_ADDR delta);
-
 /* Given REGNO, a gdb register number, return the corresponding
    number suitable for use as a ptrace() parameter.  Return -1 if
    there's no suitable mapping.  Also, set the int pointed to by