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Last-ditch maximum size limit for Sixteen

This makes sure that width * height <= INT_MAX, which it rather needs
to be.

--- a/sixteen.c

+++ b/sixteen.c

@@ -9,6 +9,7 @@

 #include <string.h>

 #include <assert.h>

 #include <ctype.h>

+#include <limits.h>

 #include <math.h>

 #include "puzzles.h"

@@ -173,6 +174,8 @@

 {

     if (params->w < 2 || params->h < 2)

 	return "Width and height must both be at least two";

+    if (params->w > INT_MAX / params->h)

+        return "Width times height must not be unreasonably large";

     return NULL;

 }