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Last-ditch maximum size limit for Pearl

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

--- a/pearl.c

+++ b/pearl.c

@@ -35,6 +35,7 @@

 #include <string.h>

 #include <assert.h>

 #include <ctype.h>

+#include <limits.h>

 #include <math.h>

 #include "puzzles.h"

@@ -272,6 +273,8 @@

 {

     if (params->w < 5) return "Width must be at least five";

     if (params->h < 5) return "Height must be at least five";

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

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

     if (params->difficulty < 0 || params->difficulty >= DIFFCOUNT)

         return "Unknown difficulty level";

     if (params->difficulty >= DIFF_TRICKY && params->w + params->h < 11)