SKAS4 - Fix x86_64 arch_copy_thread

Fix a bug which will be important later. x86_64 copy_thread needs to copy %fs from parent to child.

index d946bf2..0528d9e 100644
@@ -37,6 +37,7 @@ static inline void arch_flush_thread(struct arch_thread *thread)
 static inline void arch_copy_thread(struct arch_thread *from,
                                     struct arch_thread *to)
 {
+	to->fs = from->fs;
 }
 
 #include "asm/arch/user.h"

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