game entry file names changed to canonical version

games/xz_utils.md

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+# XZ Utils
+
+_General-purpose data compression software with a high compression ratio._
+
+- Home: https://tukaani.org/xz/
+- Media: https://en.wikipedia.org/wiki/XZ_Utils
+- State: mature
+- Download: (see home)
+- Keywords: library
+- Code repository: https://git.tukaani.org/xz.git (https://git.tukaani.org/?p=xz.git)
+- Code language: C
+- Code license: Custom (see file Copying, liblzma is public domain)
+
+Python support [lzma](https://docs.python.org/3/library/lzma.html)
+
+Supersedes [LZMA Utils](https://tukaani.org/lzma/)
+
+## Building
+
+- Build instructions: manual (see instructions in source folder windows)
+