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Last-ditch maximum size limit for Light Up

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

--- a/lightup.c

+++ b/lightup.c

@@ -47,6 +47,7 @@

 #include <string.h>

 #include <assert.h>

 #include <ctype.h>

+#include <limits.h>

 #include <math.h>

 #include "puzzles.h"

@@ -346,6 +347,8 @@

 {

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

         return "Width and height must be at least 2";

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

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

     if (full) {

         if (params->blackpc < 5 || params->blackpc > 100)

             return "Percentage of black squares must be between 5% and 100%";