kernel: fixes for DEBUG_DUMPIPC mode

. add dependency of headers on debug.d
	. put the generated headers in the right dir
	. also resilience against future ELAST duplicate errno

Change-Id: I9d10702c8e09699a40138193f14defe902399da6

kernel/Makefile

@@ -80,7 +80,7 @@ CPPFLAGS+= -DUSE_TRACE
 
 CLEANFILES+=extracted-errno.h extracted-mfield.h extracted-mtype.h procoffsets.h
 
-debug.o: extracted-errno.h extracted-mfield.h extracted-mtype.h
+debug.o debug.d: extracted-errno.h extracted-mfield.h extracted-mtype.h
 
 extracted-errno.h: extract-errno.sh ../include/errno.h
 	${_MKTARGET_CREATE}