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Last-ditch point-count limit for Untangle

Anything over INT_MAX/3 will cause an integer overflow, so put the
limit there for now.

--- a/untangle.c

+++ b/untangle.c

@@ -31,6 +31,7 @@

 #include <string.h>

 #include <assert.h>

 #include <ctype.h>

+#include <limits.h>

 #include <math.h>

 #include "puzzles.h"

@@ -206,6 +207,8 @@

 {

     if (params->n < 4)

         return "Number of points must be at least four";

+    if (params->n > INT_MAX / 3)

+        return "Number of points must not be unreasonably large";

     return NULL;

 }