Make CPURead/WriteFunc structure 'const'

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/hw/zaurus.c b/hw/zaurus.c
index 78a120c..db6ba75 100644
--- a/hw/zaurus.c
+++ b/hw/zaurus.c
@@ -142,12 +142,12 @@
     }
 }
 
-static CPUReadMemoryFunc *scoop_readfn[] = {
+static CPUReadMemoryFunc * const scoop_readfn[] = {
     scoop_readb,
     scoop_readb,
     scoop_readb,
 };
-static CPUWriteMemoryFunc *scoop_writefn[] = {
+static CPUWriteMemoryFunc * const scoop_writefn[] = {
     scoop_writeb,
     scoop_writeb,
     scoop_writeb,