Use OpenAL-soft on macOS.

Author: pchote

OpenAL-CS.dll.config

@@ -2,5 +2,5 @@
 <configuration>
 	<dllmap dll="soft_oal.dll" os="!windows" target="libopenal.so.1"/>
 	<dllmap dll="soft_oal.dll" os="openbsd" target="libopenal.so"/>
-	<dllmap dll="soft_oal.dll" os="osx" target="/System/Library/Frameworks/OpenAL.framework/OpenAL"/>
+	<dllmap dll="soft_oal.dll" os="osx" target="libopenal.1.dylib"/>
 </configuration>