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Last-ditch maximum size limit for Same Game

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

--- a/samegame.c

+++ b/samegame.c

@@ -67,6 +67,7 @@

 #include <string.h>

 #include <assert.h>

 #include <ctype.h>

+#include <limits.h>

 #include <math.h>

 #include "puzzles.h"

@@ -285,6 +286,8 @@

 {

     if (params->w < 1 || params->h < 1)

 	return "Width and height must both be positive";

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

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

     if (params->ncols > 9)

 	return "Maximum of 9 colours";