fix internal links in entry index.html from 1984 thru 2012

2004/vik2/index.html

@@ -170,7 +170,7 @@ IOCCC. I thought it was time to relive hour long compile times so I made a
 program that does (almost) all computation in the pre-processor. The program
 even causes <code>gcc</code> (and other pre-processors) to crash when configured to do
 maximum number of computations. The default configuration of the
-<a href="Makefile">Makefile</a> is set to make the program compile in a not too long time.</p>
+<a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/vik2/Makefile">Makefile</a> is set to make the program compile in a not too long time.</p>
 <p>I’ve got <code>cpp</code> to crash in a couple of different ways. Most common is to
 get a segmentation fault, but a couple of times it just got stuck in
 some infinite loop.</p>