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Fix a build failure on x32 (time_t printfs).

As that architecture has 64-bit time_t but only 32-bit longs, printf format
causes a warning.  Enter -Werror...

--- a/magnets.c

+++ b/magnets.c

@@ -2562,7 +2562,7 @@

         goto done;

     }

     s = new_game(NULL, p, desc);

-    printf("%s:%s (seed %ld)\n", id, desc, seed);

+    printf("%s:%s (seed %ld)\n", id, desc, (long)seed);

     if (aux) {

         /* We just generated this ourself. */

         if (verbose || print) {

--- a/signpost.c

+++ b/signpost.c

@@ -2393,7 +2393,7 @@

         }

     }

-    sprintf(newseed, "%lu", time(NULL));

+    sprintf(newseed, "%lu", (unsigned long) time(NULL));

     seedstr = dupstr(newseed);

     if (id || !stdin_desc) {