game entry file names changed to canonical version

games/dune_ii-the_maker.md

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+# Dune II - The Maker
+
+_Clone of the good old Dune II by Westwood Studios._
+
+- Home: http://dune2themaker.fundynamic.com/
+- State: beta
+- Download: http://dune2themaker.fundynamic.com/?page_id=11
+- Keywords: strategy, real time
+- Code repository: https://github.com/Fundynamic/dune2themaker4j.git
+- Code language: Java
+- Code license: MIT
+
+License of artwork
+
+## Building
+