Make the code base clean under -Wwrite-strings.

I've also added that warning option and -Werror to the build script,
so that I'll find out if I break this property in future.

1 files changed, 1 insertions, 1 deletions

diff --git a/cube.c b/cube.c
index f09f63d..2a79a81 100644
--- a/cube.c
+++ b/cube.c
@@ -238,7 +238,7 @@ static game_params *default_params(void)
 static int game_fetch_preset(int i, char **name, game_params **params)
 {
     game_params *ret = snew(game_params);
-    char *str;
+    const char *str;
 
     switch (i) {
       case 0: