Fix build error on OSX

[Tristan Gingold]

On Nov 6, 2009, at 7:15 AM, Alan Modra wrote:

> On Fri, Nov 06, 2009 at 01:47:57PM +0900, Masaki Muranaka wrote:
>> Why are you concluding I didn't test? ;-)
>
> Your patch sets -Werror in CFLAGS.  How can setting -Werror avoid an
> error caused by -Werror?

I think this is a wrong patch for a real issue.
autoconf tests wether stat64 is usable but even with --enable-werror,  
it didn't check that warnings are
generated.
As a consequence, compilation of strings.c fails.

Adding unconditionally -Werror is wrong because this should at least  
be handled with --enable-werror.
Looks like there is something to do within autoconf but I am not an  
expert at all in it.

My two cents,
Tristan.