UML - Fix registers.c build

uml-stop-saving-process-fp-state.patch broke the UML/x86_64 build.

On x86_64, sys/ptrace.h has to be included before asm/ptrace.h. Otherwise, the defines in asm/ptrace.h will ruin the parse of sys/ptrace.h -

    asm/ptrace.h:
	#define PTRACE_GETREGS            12

    sys/ptrace.h:
	enum __ptrace_request
	{
	...
	   PTRACE_GETREGS = 12,
	...
	}

Also, errno.h was missing.

---
 arch/um/os-Linux/sys-x86_64/registers.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux-2.6.20/arch/um/os-Linux/sys-x86_64/registers.c
===================================================================
@@ -3,9 +3,10 @@
  * Licensed under the GPL
  */
 
+#include <errno.h>
+#include <sys/ptrace.h>
 #define __FRAME_OFFSETS
 #include <asm/ptrace.h>
-#include <sys/ptrace.h>
 #include "longjmp.h"
 #include "user.h"
 

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