glob.h lack of #includes

[Roland McGrath]

> - use the hack I wrote down in the last mail.  This should work but must
>   be tested.

If it works, it's fine with me.

> - include <sys/types.h>
> 
> The later will probably even create more problems if the same file is
> used in make on non-POSIX platforms.

I'm not so sure this will create problems, and anyway we can have those
port maintainers bang on it before we come to a final decision about it.
But if there is a way to get just size_t that is not horribly kludgey,
I'd tend to favor that minimal addition rather than the whole of <sys/types.h>.