fix: Swift build tool compiling error

Package.swift

@@ -57,13 +57,7 @@ let package = Package(
             dependencies: [
                 "libsmb2",
             ],
-            path: "AMSMB2",
-            swiftSettings: [
-                .unsafeFlags([
-                    "-Xfrontend", "-warn-concurrency",
-                    "-Xfrontend", "-enable-actor-data-race-checks",
-                ]),
-            ]
+            path: "AMSMB2"
         ),
         .testTarget(
             name: "AMSMB2Tests",

Package@swift-5.8.swift

@@ -0,0 +1,82 @@
+// swift-tools-version:5.8
+import PackageDescription
+
+let package = Package(
+    name: "AMSMB2",
+    platforms: [
+        .iOS(.v13),
+        .macOS(.v10_15),
+        .macCatalyst(.v13),
+        .tvOS(.v14),
+        .watchOS(.v6),
+    ],
+    products: [
+        .library(
+            name: "AMSMB2",
+            type: .dynamic,
+            targets: ["AMSMB2"]
+        ),
+    ],
+    dependencies: [
+        .package(url: "https://github.com/apple/swift-atomics.git", .upToNextMajor(from: "1.2.0")),
+    ],
+    targets: [
+        .target(
+            name: "libsmb2",
+            path: "Dependencies/libsmb2",
+            exclude: [
+                "lib/CMakeLists.txt",
+                "lib/libsmb2.syms",
+                "lib/Makefile.am",
+                "lib/Makefile.DC_KOS",
+                "lib/Makefile.PS2_EE",
+                "lib/Makefile.PS2_IOP",
+                "lib/Makefile.PS3_PPU",
+                "lib/Makefile.PS4",
+            ],
+            sources: [
+                "lib",
+            ],
+            publicHeadersPath: ".",
+            cSettings: [
+                .headerSearchPath("include"),
+                .headerSearchPath("include/apple"),
+                .headerSearchPath("include/smb2"),
+                .headerSearchPath("lib"),
+                .define("_U_", to: "__attribute__((unused))"),
+                .define("HAVE_CONFIG_H", to: "1"),
+                .unsafeFlags([
+                    "-Wno-everything",
+                ]),
+            ],
+            linkerSettings: [
+            ]
+        ),
+        .target(
+            name: "AMSMB2",
+            dependencies: [
+                "libsmb2",
+            ],
+            path: "AMSMB2"
+        ),
+        .testTarget(
+            name: "AMSMB2Tests",
+            dependencies: [
+                "AMSMB2",
+                .product(name: "Atomics", package: "swift-atomics"),
+            ],
+            path: "AMSMB2Tests"
+        ),
+    ],
+    swiftLanguageVersions: [.v5]
+)
+
+for target in package.targets {
+    var swiftSettings: [SwiftSetting] = [
+        .enableExperimentalFeature("StrictConcurrency=complete"),
+    ]
+#if swift(>=5.9)
+    swiftSettings.append(.enableUpcomingFeature("ExistentialAny"))
+#endif
+    target.swiftSettings = swiftSettings
+}