remove old lock definitions

Reference: /n/atom/patch/applied/nixmcsfinal
Date: Sun Aug 16 06:00:56 CES 2015
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/dat.h	Sun Aug 16 06:00:47 2015
+++ /sys/src/nix/k10/dat.h	Sun Aug 16 06:00:48 2015
@@ -32,40 +32,11 @@
 /*
  *  machine dependent definitions used by ../port/portdat.h
  */
-#ifdef Taslock
-struct Lock
-{
-	u32int	key;
-	int	isilock;
-	Mpl	pl;
-	uintptr	pc;
-	Proc*	p;
-	Mach*	m;
-	uvlong	lockcycles;
-};
-#else
-#ifdef Tiklock
-enum {
-	Cachelinesz	= 64,
-};
-struct Lock
-{
-	uchar	pad[Cachelinesz*2];
-	Mpl	pl;
-	int	isilock;
-	uintptr	pc;
-	Proc*	p;
-	Mach*	m;
-	uvlong	lockcycles;
-};
-#else
 struct Lock
 {
 	LockEntry*	head;
 	LockEntry*	e;
 };
-#endif
-#endif
 
 struct Label
 {