fix <ctype.h> bugs on 64-bit machine

[Eric Blake]

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According to Jon TURNEY on 11/5/2009 5:11 PM:
> int main()
> {
>         int c;
>         int t = isspace(c = ' ');
> }
> 
> after this ctype.h change, with the current cygwin gcc4, compilation
> fails 'error: lvalue required as left operand of assignment'.

Thanks for spotting this.  Your patch is correct, so I applied it as obvious.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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