Fixes and updates to 2000/tomx

Format fixes in README.md.

Link fix via the Internet Wayback Machine. This was also fixed in
winners.csv and winners.html.

Copy ../mkentry.c to this directory because the author made an example
of where one can modify the program to compile it instead - it felt
better than to change it to ../mkentry.c as that assumes the directory
structure is the same.

Added mkentry to .gitignore.

winners.html

@@ -663,7 +663,7 @@ Contest </I></FONT></CENTER><BR>
 <!--  J  J  J  J  J  J  J  J  J  J  J  J  J  J  J  J  J  J  J  J  J  J  J - -->
 
 <UL>
-<LI TYPE=none><A NAME="Thomas_P_John"></A><B><a href="&#109;&#97;&#x69;&#108;&#x74;&#111;&#58;&#x74;&#x68;&#x6F;&#x6D;&#x61;&#x73;&#x70;j&#x6F;&#x68;&#x6E;&#64;&#x68;&#x6F;&#x74;m&#97;&#105;l&#x2E;&#99;&#x6F;&#x6D;">Thomas P John</a></B> -- <A HREF="http://tomx.tripod.com/">http://tomx.tripod.com/</a>
+<LI TYPE=none><A NAME="Thomas_P_John"></A><B><a href="&#109;&#97;&#x69;&#108;&#x74;&#111;&#58;&#x74;&#x68;&#x6F;&#x6D;&#x61;&#x73;&#x70;j&#x6F;&#x68;&#x6E;&#64;&#x68;&#x6F;&#x74;m&#97;&#105;l&#x2E;&#99;&#x6F;&#x6D;">Thomas P John</a></B> -- <A HREF="https://web.archive.org/web/20010720192926/http://tomx.tripod.com/">https://web.archive.org/web/20010720192926/http://tomx.tripod.com/</a>
 <UL>
 <LI TYPE=square>Most Complete Program (<A HREF="years.html#2000_tomx">2000 tomx</A>)
 </UL><BR>