Bump swift-tools-version to 5.9 for visionOS support

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.0
+// swift-tools-version:5.9
 import PackageDescription
 
 #if canImport(Compression)

Package@swift-4.0.swift

@@ -1,7 +1,7 @@
 // swift-tools-version:4.0
 import PackageDescription
 
-#if os(macOS) || os(iOS) || os(watchOS) || os(tvOS) || os(visionOS)
+#if os(macOS) || os(iOS) || os(tvOS) || os(visionOS) || os(watchOS)
 let dependencies: [Package.Dependency] = []
 #else
 let dependencies: [Package.Dependency] = [.package(url: "https://github.com/IBM-Swift/CZlib.git", .exact("0.1.2"))]

Package@swift-5.0.swift

@@ -0,0 +1,27 @@
+// swift-tools-version:5.0
+import PackageDescription
+
+#if canImport(Compression)
+let targets: [Target] = [
+    .target(name: "ZIPFoundation"),
+    .testTarget(name: "ZIPFoundationTests", dependencies: ["ZIPFoundation"])
+]
+#else
+let targets: [Target] = [
+    .systemLibrary(name: "CZLib", pkgConfig: "zlib", providers: [.brew(["zlib"]), .apt(["zlib"])]),
+    .target(name: "ZIPFoundation", dependencies: ["CZLib"], cSettings: [.define("_GNU_SOURCE", to: "1")]),
+    .testTarget(name: "ZIPFoundationTests", dependencies: ["ZIPFoundation"])
+]
+#endif
+
+let package = Package(
+    name: "ZIPFoundation",
+    platforms: [
+        .macOS(.v10_11), .iOS(.v9), .tvOS(.v9), .watchOS(.v2)
+    ],
+    products: [
+        .library(name: "ZIPFoundation", targets: ["ZIPFoundation"])
+    ],
+    targets: targets,
+    swiftLanguageVersions: [.v4, .v4_2, .v5]
+)