Working on Thread for latest Swift 3.0 on Linux

Author: colemancda

Sources/SwiftFoundation/Thread.swift

@@ -25,10 +25,10 @@ public final class Thread {
 
         let holder = Unmanaged.passRetained(Closure(closure: closure))
 
-        let pointer = UnsafeMutablePointer<Void>(OpaquePointer(bitPattern: holder))
-        
         #if os(Linux)
 
+            let pointer = UnsafeMutablePointer<Void>(holder.toOpaque())
+            
             var internalThread: pthread_t = 0
 
             guard pthread_create(&internalThread, nil, ThreadPrivateMainLinux, pointer) == 0
@@ -40,6 +40,8 @@ public final class Thread {
 
         #elseif os(OSX) || os(iOS) || os(watchOS) || os(tvOS)
 
+            let pointer = UnsafeMutablePointer<Void>(OpaquePointer(bitPattern: holder))
+            
             var internalThread: pthread_t? = nil
 
             guard pthread_create(&internalThread, nil, ThreadPrivateMainDarwin, pointer) == 0