Adopt Concurrency adoption guidelines

Author: stevapple

Sources/AWSLambdaRuntimeCore/Lambda.swift

@@ -53,7 +53,7 @@ public enum Lambda {
         return String(cString: value)
     }
 
-    #if swift(>=5.5)
+    #if compiler(>=5.5) && canImport(_Concurrency)
     // for testing and internal use
     @available(macOS 12, iOS 15, tvOS 15, watchOS 8, *)
     internal static func run<Handler: LambdaHandler>(configuration: Configuration = .init(), handlerType: Handler.Type) -> Result<Int, Error> {

Sources/AWSLambdaRuntimeCore/LambdaHandler.swift

@@ -17,7 +17,7 @@ import NIOCore
 
 // MARK: - LambdaHandler
 
-#if compiler(>=5.5)
+#if compiler(>=5.5) && canImport(_Concurrency)
 /// Strongly typed, processing protocol for a Lambda that takes a user defined `Event` and returns a user defined `Output` async.
 @available(macOS 12, iOS 15, tvOS 15, watchOS 8, *)
 public protocol LambdaHandler: EventLoopLambdaHandler {

Sources/AWSLambdaTesting/Lambda+Testing.swift

@@ -33,7 +33,7 @@
 //     XCTAssertEqual(result, "echo" + input)
 // }
 
-#if swift(>=5.5)
+#if compiler(>=5.5) && canImport(_Concurrency)
 import AWSLambdaRuntime
 import AWSLambdaRuntimeCore
 import Dispatch

Tests/AWSLambdaRuntimeCoreTests/LambdaHandlerTest.swift

@@ -17,7 +17,7 @@ import NIOCore
 import XCTest
 
 class LambdaHandlerTest: XCTestCase {
-    #if compiler(>=5.5)
+    #if compiler(>=5.5) && canImport(_Concurrency)
 
     // MARK: - LambdaHandler
 

Tests/AWSLambdaRuntimeTests/Lambda+CodeableTest.swift renamed to Tests/AWSLambdaRuntimeTests/Lambda+CodableTest.swift

@@ -82,7 +82,7 @@ class CodableLambdaTest: XCTestCase {
         XCTAssertEqual(response?.requestId, request.requestId)
     }
 
-    #if swift(>=5.5)
+    #if compiler(>=5.5) && canImport(_Concurrency)
     @available(macOS 12, iOS 15, tvOS 15, watchOS 8, *)
     func testCodableVoidHandler() {
         struct Handler: LambdaHandler {
@@ -183,7 +183,7 @@ private struct Response: Codable, Equatable {
     }
 }
 
-#if swift(>=5.5)
+#if compiler(>=5.5) && canImport(_Concurrency)
 // NOTE: workaround until we have async test support on linux
 //         https://github.com/apple/swift-corelibs-xctest/pull/326
 extension XCTestCase {

Tests/AWSLambdaTestingTests/Tests.swift

@@ -12,7 +12,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if swift(>=5.5)
+#if compiler(>=5.5) && canImport(_Concurrency)
 import AWSLambdaRuntime
 import AWSLambdaTesting
 import NIOCore