[ARM] Fixes for arm str* routines

[Jeff Johnston]

Patches checked in.  Thanks.

-- Jeff J.

Richard Earnshaw wrote:
> Another couple of bugs have been found in the string routines that I
> posted recently.  The first, fixed by Mark Mitchell, concerns the
> thumb-2 compilation of strlen (strings shorter than 4 bytes could
> sometimes be reported as being longer than 4 bytes).
>
> The second is a case of an unfortunate (l)user.  Anyone unfortunate
> enough to have a string that contained 0x80 would find that the routines
> treated that as an end-of-string marker, leading to short strings.
>
> Fixed thusly:
>
> 2009-03-09  Mark Mitchell  <mark@codesourcery.com>
>
>         * libc/machine/arm/strlen.c (strlen): Fix defect in Thumb-2 mode.
>
> 2009-03-12  Richard Earnshaw  <rearnsha@arm.com>
>
> 	* libc/machine/arm/strlen.c (strlen): Correctly detect
> 	end-of-string.
> 	* libc/machine/arm/strcpy.c (strcpy): Likewise.
> 	* libc/machine/arm/strcmp.c (strcmp, strcmp_unaligned): Likewise.
>
>
>