Remove conio from the core.

* It is provided by conio.prg, which is loaded at boot time.
diff --git a/contiki-cpc/Makefile.cpc b/contiki-cpc/Makefile.cpc
index 6703e7e..9d6359e 100644
--- a/contiki-cpc/Makefile.cpc
+++ b/contiki-cpc/Makefile.cpc
@@ -66,7 +66,6 @@
 	./loader/loader-arch-cpc.o \
 	./arch/putchar.o \
 	./arch/uip.o \
-	./arch/conio.o \
 	./apps/configedit.o \
 	./apps/configedit-dsc.o \
 	../contiki/apps/directory.o \
@@ -75,7 +74,6 @@
 	../contiki/apps/processes-dsc.o \
 	../contiki/apps/program-handler.o \
 	../contiki/ctk/ctk.o \
-	../contiki/ctk/ctk-conio-service.o \
 	../contiki/ctk/ctk-draw.o \
 	../contiki/ctk/ctk-term-in.o \
 	../contiki/ctk/ctk-term-out.o \
@@ -100,7 +98,6 @@
 	./lib/strcasecmp.o \
 	$(UIP)
 
-
 contiki: $(CONTIKI_OBJ)
 	$(LD) -f arch/contiki.lnk
 	./bin/make_labels contiki.map arch/contiki_labels.s