wininet: Include limits.h to define UINT_MAX and ULONG_MAX.

Fixes build error on macOS introduced by commit 968201424d

Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/wininet/http.c

@@ -43,6 +43,7 @@
 #include <time.h>
 #include <assert.h>
 #include <errno.h>
+#include <limits.h>
 
 #include "windef.h"
 #include "winbase.h"