Add two missed files in previous commit

libraries/build-macos-libs.sh

@@ -1111,7 +1111,7 @@ echo "Building OpenAL Soft"
 	mkdir -p openal-soft
 	cd openal-soft
 
-	if [ $force_rebuild = "true" ] || [ ! -e .already-built ] || [ "$(cat .already-built)" != "$OPENAL_SOFT_VERSION+1" ]; then
+	if [ $force_rebuild = "true" ] || [ ! -e .already-built ] || [ "$(cat .already-built)" != "$OPENAL_SOFT_VERSION" ]; then
 		INSTALL_DIR="$(pwd)"
 
 		rm -f .already-built

source/lib/external_libraries/openal.h

@@ -1,4 +1,4 @@
-/* Copyright (C) 2010 Wildfire Games.
+/* Copyright (C) 2024 Wildfire Games.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
@@ -27,13 +27,8 @@
 #ifndef INCLUDED_OPENAL
 #define INCLUDED_OPENAL
 
-#if OS_MACOSX
-# include <OpenAL/al.h>
-# include <OpenAL/alc.h>
-#else
-# include <AL/al.h>
-# include <AL/alc.h>
-#endif
+#include <AL/al.h>
+#include <AL/alc.h>
 
 // ALC strings (e.g. device and extension names) are typed differently
 // between OpenAL specifications