move CZlib in linux

Package.swift

@@ -33,8 +33,6 @@ let package = Package(
         .package(url: "https://github.com/IBM-Swift/BlueCryptor.git", from: "1.0.0"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
         .systemLibrary(
             name: "CZlib",
             pkgConfig: "libz",

Sources/KituraWebSocket/PermessageDeflateCompressor.swift

@@ -16,7 +16,11 @@
 
 import NIO
 import NIOWebSocket
+#if os(Linux)
 import CZlib
+#else
+import zlib
+#endif
 
 // Implementation of a deflater using zlib. This ChannelOutboundHandler acts like an interceptor, consuming original frames written by
 // WebSocketConnection, compressing the payload and writing the new frames with a compressed payload onto the channel.

Sources/KituraWebSocket/PermessageDeflateDecompressor.swift

@@ -15,8 +15,12 @@
  */
 
 import NIO
-import CZlib
 import NIOWebSocket
+#if os(Linux)
+import CZlib
+#else
+import zlib
+#endif
 
 // Implementation of `PermessageDeflateDecompressor` a `ChannelInboundHandler` that intercepts incoming WebSocket frames, inflating the payload and
 // writing the new frames back to the channel, to be eventually received by WebSocketConnection.

Tests/KituraWebSocketTests/InflaterDeflaterTests.swift

@@ -17,7 +17,11 @@
 import XCTest
 import Foundation
 import NIO
+#if os(Linux)
 import CZlib
+#else
+import zlib
+#endif
 
 @testable import KituraWebSocket