Issue-2900 - Add VisionOS support (#2947)

Add Vision support

### Motivation:
#2900 - close this

### Modifications:
- Bump SystemPackage to 1.4.0 and remove @preconcurrency 
- remove `#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS) ||
os(Linux) || os(Android)` to allow for visionOS support
- Remove conditional import for swift system

### Result:

Vision OS support

Author: ali-ahsan-ali

Package.swift

@@ -21,11 +21,7 @@ import class Foundation.ProcessInfo
 
 let swiftAtomics: PackageDescription.Target.Dependency = .product(name: "Atomics", package: "swift-atomics")
 let swiftCollections: PackageDescription.Target.Dependency = .product(name: "DequeModule", package: "swift-collections")
-let swiftSystem: PackageDescription.Target.Dependency = .product(
-    name: "SystemPackage",
-    package: "swift-system",
-    condition: .when(platforms: [.macOS, .iOS, .tvOS, .watchOS, .linux, .android])
-)
+let swiftSystem: PackageDescription.Target.Dependency = .product(name: "SystemPackage", package: "swift-system")
 
 // These platforms require a depdency on `NIOPosix` from `NIOHTTP1` to maintain backward
 // compatibility with previous NIO versions.
@@ -558,7 +554,7 @@ if Context.environment["SWIFTCI_USE_LOCAL_DEPS"] == nil {
     package.dependencies += [
         .package(url: "https://github.com/apple/swift-atomics.git", from: "1.1.0"),
         .package(url: "https://github.com/apple/swift-collections.git", from: "1.0.2"),
-        .package(url: "https://github.com/apple/swift-system.git", from: "1.2.0"),
+        .package(url: "https://github.com/apple/swift-system.git", from: "1.4.0"),
     ]
 } else {
     package.dependencies += [

Sources/NIOFileSystem/BufferedReader.swift

@@ -12,7 +12,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS) || os(Linux) || os(Android)
 import DequeModule
 import NIOCore
 
@@ -240,5 +239,3 @@ extension ReadableFileHandleProtocol {
         BufferedReader(wrapping: self, initialOffset: initialOffset, capacity: Int(capacity.bytes))
     }
 }
-
-#endif

Sources/NIOFileSystem/BufferedWriter.swift

@@ -12,7 +12,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS) || os(Linux) || os(Android)
 import NIOCore
 
 /// A writer which buffers bytes in memory before writing them to the file system.
@@ -244,5 +243,3 @@ extension WritableFileHandleProtocol {
         }
     }
 }
-
-#endif

Sources/NIOFileSystem/ByteBuffer+FileSystem.swift

@@ -12,7 +12,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS) || os(Linux) || os(Android)
 import NIOCore
 
 @available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *)
@@ -96,5 +95,3 @@ extension ByteBuffer {
         )
     }
 }
-
-#endif

Sources/NIOFileSystem/ByteCount.swift

@@ -12,8 +12,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS) || os(Linux) || os(Android)
-
 /// Represents the number of bytes.
 public struct ByteCount: Hashable, Sendable {
     /// The number of bytes
@@ -117,5 +115,3 @@ extension ByteCount: Comparable {
         lhs.bytes < rhs.bytes
     }
 }
-
-#endif

Sources/NIOFileSystem/Convenience.swift

@@ -12,7 +12,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS) || os(Linux) || os(Android)
 import SystemPackage
 
 extension String {
@@ -201,5 +200,3 @@ extension AsyncSequence where Self.Element == UInt8, Self: Sendable {
         )
     }
 }
-
-#endif

Sources/NIOFileSystem/DirectoryEntries.swift

@@ -12,13 +12,12 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS) || os(Linux) || os(Android)
 import CNIODarwin
 import CNIOLinux
 import NIOConcurrencyHelpers
 import NIOCore
 import NIOPosix
-@preconcurrency import SystemPackage
+import SystemPackage
 
 /// An `AsyncSequence` of entries in a directory.
 @available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *)
@@ -737,5 +736,3 @@ extension UnsafeMutablePointer<CInterop.FTSEnt> {
         FilePath(platformString: self.pointee.fts_path!)
     }
 }
-
-#endif

Sources/NIOFileSystem/DirectoryEntry.swift

@@ -12,8 +12,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS) || os(Linux) || os(Android)
-@preconcurrency import SystemPackage
+import SystemPackage
 
 /// Information about an item within a directory.
 public struct DirectoryEntry: Sendable, Hashable, Equatable {
@@ -46,5 +45,3 @@ public struct DirectoryEntry: Sendable, Hashable, Equatable {
         self.type = type
     }
 }
-
-#endif

Sources/NIOFileSystem/Exports.swift

@@ -12,14 +12,10 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS) || os(Linux) || os(Android)
-
 // These types are used in our public API; expose them to make
 // life easier for users.
 @_exported import enum SystemPackage.CInterop
 @_exported import struct SystemPackage.Errno
 @_exported import struct SystemPackage.FileDescriptor
 @_exported import struct SystemPackage.FilePath
 @_exported import struct SystemPackage.FilePermissions
-
-#endif

Sources/NIOFileSystem/FileChunks.swift

@@ -12,11 +12,10 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS) || os(Linux) || os(Android)
 import NIOConcurrencyHelpers
 import NIOCore
 import NIOPosix
-@preconcurrency import SystemPackage
+import SystemPackage
 
 /// An `AsyncSequence` of ordered chunks read from a file.
 @available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *)
@@ -544,4 +543,3 @@ extension ProducerState.Producing {
         return .moreToRead
     }
 }
-#endif