Move archtypes.h, fpu.h, and stackframe.h

Move archtypes.h to include/ dir, since several servers require it. Move
fpu.h and stackframe.h to arch-specific header directory. Make source
files and makefiles aware of the new header locations.

kernel/priv.h

@@ -13,6 +13,7 @@
  *   Jul 01, 2005  Created.  (Jorrit N. Herder)	
  */
 #include <minix/com.h>
+#include <minix/const.h>
 #include "const.h"
 #include "type.h"