string constants

<Someone> wrote:
> Linux, Redhat 7.1 nethack 3.4.0
>
>Please see attached patch file.
>
>I'm attempting to move more stuff into the "read-only" area, in
>preparation for a port to another OS.

src/version.c

@@ -112,7 +112,7 @@ void
 store_version(fd)
 int fd;
 {
-	static struct version_info version_data = {
+	const static struct version_info version_data = {
 			VERSION_NUMBER, VERSION_FEATURES,
 			VERSION_SANITY1, VERSION_SANITY2
 	};