complete missing essential fields (home, state) on entries

games/library/open_al_soft.md

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+# Open AL Soft
+
+_Software implementation of the OpenAL 3D audio API._
+
+- Home: http://kcat.strangesoft.net/openal.html
+- Media: https://en.wikipedia.org/wiki/OpenAL#Implementations
+- State: mature
+- Code repository: http://repo.or.cz/openal-soft.git
+- Code language: C
+- Code license: LGPL-2.0
+
+## Building
+
+- Build system: CMake
+