limits.h fix

[Mike Stump]

On Apr 2, 2007, at 2:11 PM, Mike Stump wrote:
> Currently, if a user has their own "limits.h", the:
>
>   #include_next <limits.h>
>
> in syslimits.h can find it, this is wrong.  Instead, we want that file
> to find the system limits.h.  The below patch fixes this.

In addition, I think the patch also fixes:

#import <limits.h>

int main(int argc, char **argv)
{
   char path [PATH_MAX];
   path[0] = '\0';
   return 0;
}