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Last-ditch maximum size limit for Bridges

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

--- a/bridges.c

+++ b/bridges.c

@@ -72,6 +72,7 @@

 #include <string.h>

 #include <assert.h>

 #include <ctype.h>

+#include <limits.h>

 #include <math.h>

 #include "puzzles.h"

@@ -803,6 +804,8 @@

 {

     if (params->w < 3 || params->h < 3)

         return "Width and height must be at least 3";

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

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

     if (params->maxb < 1 || params->maxb > MAX_BRIDGES)

         return "Too many bridges.";

     if (full) {