advapi32: Constify some variables.
diff --git a/dlls/advapi32/crypt.h b/dlls/advapi32/crypt.h
index 3d630da..d9018f4 100644
--- a/dlls/advapi32/crypt.h
+++ b/dlls/advapi32/crypt.h
@@ -93,6 +93,6 @@
     unsigned char *Buffer;
 };
 
-NTSTATUS WINAPI SystemFunction032(struct ustring *data, struct ustring *key);
+NTSTATUS WINAPI SystemFunction032(struct ustring *data, const struct ustring *key);
 
 #endif /* __WINE_CRYPT_H_ */