openalsoft audio fix (#552)

Co-authored-by: Smokey <78874128+Smokey555@users.noreply.github.com>
Co-authored-by: Cobalt Bar <79053181+CobaltBar@users.noreply.github.com>

source/funkin/backend/system/modules/ALSoftConfig.hx

@@ -0,0 +1,31 @@
+package funkin.backend.system.modules;
+
+import haxe.io.Path;
+
+/*
+ * A class that simply points OpenALSoft to a custom configuration file when
+ * the game starts up.
+ *
+ * The config overrides a few global OpenALSoft settings with the aim of
+ * improving audio quality on desktop targets.
+ */
+@:keepInit class ALSoftConfig
+{
+	#if desktop
+	static function __init__():Void
+	{
+		var origin:String = #if hl Sys.getCwd() #else Sys.programPath() #end;
+
+		var configPath:String = Path.directory(Path.withoutExtension(origin));
+		#if windows
+		configPath += "/plugins/alsoft.ini";
+		#elseif mac
+		configPath = Path.directory(configPath) + "/Resources/plugins/alsoft.conf";
+		#else
+		configPath += "/plugins/alsoft.conf";
+		#end
+
+		Sys.putEnv("ALSOFT_CONF", configPath);
+	}
+	#end
+}