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Tighten Bridges' validate_desc()

It allowed V, W, X, Y, H, I, J, and K to appear in game descriptions
even though new_game() didn't ascribe any meaning to those letters and
would fail an assertion if they ever occurred.  As far as I can tell,
those letters have never done anything, so I've just removed the
checks for them from validate_desc().

--- a/bridges.c

+++ b/bridges.c

@@ -2016,11 +2016,6 @@

             i += *desc - 'a'; /* plus the i++ */

         else if (*desc >= 'A' && *desc <= 'G')

             /* OK */;

-        else if (*desc == 'V' || *desc == 'W' ||

-                 *desc == 'X' || *desc == 'Y' ||

-                 *desc == 'H' || *desc == 'I' ||

-                 *desc == 'J' || *desc == 'K')

-            /* OK */;

         else if (!*desc)

             return "Game description shorter than expected";

         else