Make CPC version run from ROM

This frees up an extra 11K of RAM for apps.

It is still slightly broken: glitches during start of the ROM, and the
desktop icons are somehow missing. I don't know why yet...
diff --git a/contiki-cpc/arch/contiki.lnk b/contiki-cpc/arch/contiki.lnk
index 49240a3..23c458d 100644
--- a/contiki-cpc/arch/contiki.lnk
+++ b/contiki-cpc/arch/contiki.lnk
@@ -1,6 +1,8 @@
 -imwn contiki
+-b _INITIALIZED=0x0100
+-b _CODE=0xc000
+-b _INITIALIZER=0xec00
 -k /system/data/sdcc/lib/z80
--b _CODE=0x0100
 -l z80
 ./arch/crt0.o
 ./arch/key.o