complete missing essential fields (home, state) on entries

games/library/open_al.md

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+# Open AL
+
+_Cross-platform audio application programming interface (API)._
+
+- Home: http://www.openal.org/
+- Media: https://en.wikipedia.org/wiki/OpenAL
+- State: mature
+- Code repository: http://www.openal.org/downloads/
+- Code license: Proprietary
+- Code license details: since v1.1, LGPL before
+
+## Building
+