<machine/signal.h>

. use netbsd sigframe, sigcontext struct
	. netbsd sigframe *contains* sigcontext; use that directly
	  in kernel sigsend
	. drop two fields from minix x86 stackframe.h (process context)
	  that were unused, retadr and st

use in-sigframe sigcontext

Change-Id: Ib59d699596dc3a78163dee59f19730482fdddf11

lib/libvassert/vassert.c

@@ -7,6 +7,7 @@
 #include <minix/ipc.h>
 #include <minix/com.h>
 #include <minix/syslib.h>
+#include <machine/stackframe.h>
 #include "vassert.h"
 
 VAssert_StateWrapper vassert_state ALIGNED(VASSERT_PAGE_SIZE);