Fix standard kse breakge of non-x86 platforms. sigh.

Pointy hat to:	kse

sys/sparc64/sparc64/trap.c

@@ -581,7 +581,7 @@ syscall(struct trapframe *tf)
 		 * but for now do it every time.
 		 */
 		td->td_mailbox = (void *)fuword((caddr_t)td->td_kse->ke_mailbox
-		    + offsetof(struct kse_mailbox, kmbx_current_thread));
+		    + offsetof(struct kse_mailbox, km_curthread));
 		if ((td->td_mailbox == NULL) ||
 		    (td->td_mailbox == (void *)-1)) {
 			td->td_mailbox = NULL;  /* single thread it.. */

sys/sparc64/sparc64/vm_machdep.c

@@ -118,32 +118,16 @@ cpu_thread_setup(struct thread *td)
 {
 }
 
-void
-cpu_save_upcall(struct thread *td, struct kse *newkse)
-{
-}
-
 void
 cpu_set_upcall(struct thread *td, void *pcb)
 {
 }
 
 void
-cpu_set_args(struct thread *td, struct kse *ke)
+cpu_set_upcall_kse(struct thread *td, struct kse *ke)
 {
 }
 
-void
-cpu_free_kse_mdstorage(struct kse *ke)
-{
-}
-
-int
-cpu_export_context(struct thread *td)
-{
-	return (0);
-}
-
 /*
  * Finish a fork operation, with process p2 nearly set up.
  * Copy and update the pcb, set up the stack so that the child