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/interrupt.c

@@ -15,7 +15,7 @@
 
 #include "kernel.h"
 #include "proc.h"
-#include <archconst.h>
+#include "archconst.h"
 
 #include "arch/i386/hw_intr.h"