Add fallback compression algorithm

Disabled.

TunnelKit/Sources/Protocols/OpenVPN/Configuration.swift

@@ -168,6 +168,8 @@ extension OpenVPN {
         static let digest: Digest = .sha1
         
         static let compressionFraming: CompressionFraming = .disabled
+        
+        static let compressionAlgorithm: CompressionAlgorithm = .disabled
     }
     
     /// The way to create a `Configuration` object for a `OpenVPNSession`.
@@ -351,6 +353,11 @@ extension OpenVPN {
         public var fallbackCompressionFraming: CompressionFraming {
             return compressionFraming ?? Fallback.compressionFraming
         }
+        
+        /// :nodoc:
+        public var fallbackCompressionAlgorithm: CompressionAlgorithm {
+            return compressionAlgorithm ?? Fallback.compressionAlgorithm
+        }
     }
     
     /// The immutable configuration for `OpenVPNSession`.