uml: remove warnings added by previous -stable patch

[Paolo 'Blaisorblade' Giarrusso]

From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@xxxxxxxx>

Add needed includes for syscall() function, also to remove warnings spit out by
GCC; they were added by previous -stable patch, and at least on my system
(Ubuntu x86-64) these warnings do show up.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@xxxxxxxx>
Index: linux-2.6.18/arch/um/os-Linux/sys-i386/tls.c
===================================================================
--- linux-2.6.18.orig/arch/um/os-Linux/sys-i386/tls.c
+++ linux-2.6.18/arch/um/os-Linux/sys-i386/tls.c
@@ -1,4 +1,6 @@
 #include <errno.h>
+#include <sys/syscall.h>
+#include <unistd.h>
 #include <linux/unistd.h>
 #include "sysdep/tls.h"
 #include "user_util.h"
Index: linux-2.6.18/arch/um/os-Linux/tls.c
===================================================================
--- linux-2.6.18.orig/arch/um/os-Linux/tls.c
+++ linux-2.6.18/arch/um/os-Linux/tls.c
@@ -1,6 +1,8 @@
 #include <errno.h>
 #include <sys/ptrace.h>
+#include <sys/syscall.h>
 #include <asm/ldt.h>
+#include <unistd.h>
 #include "sysdep/tls.h"
 #include "uml-config.h"
 
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