Undo totally broken m68k patch.

Note to self: any m68k patch that touches a SMP file is
likely not worth it.

Cset exclude: geert@linux-m68k.org[torvalds]|ChangeSet|20041101000206|42067

include/linux/smp_lock.h

@@ -2,6 +2,7 @@
 #define __LINUX_SMPLOCK_H
 
 #include <linux/config.h>
+#include <linux/sched.h>
 #include <linux/spinlock.h>
 
 #ifdef CONFIG_LOCK_KERNEL