Fix additional const issues.

libmisc/obscure.c

@@ -226,7 +226,7 @@ static const char *obscure_msg (const char *old, const char *new,
 	size_t maxlen, oldlen, newlen;
 	char *new1, *old1;
 	const char *msg;
-	char *result;
+	const char *result;
 
 	oldlen = strlen (old);
 	newlen = strlen (new);

libmisc/setugid.c

@@ -131,7 +131,7 @@ int setup_uid_gid (const struct passwd *info)
 
 #if defined (HAVE_INITGROUPS) && ! defined (USE_PAM)
 	if (is_console) {
-		char *cp = getdef_str ("CONSOLE_GROUPS");
+		const char *cp = getdef_str ("CONSOLE_GROUPS");
 
 		if ((NULL != cp) && (add_groups (cp) != 0)) {
 			perror ("Warning: add_groups");

libmisc/setupenv.c

@@ -200,7 +200,7 @@ static void read_env_file (const char *filename)
 void setup_env (struct passwd *info)
 {
 #ifndef USE_PAM
-	char *envf;
+	const char *envf;
 #endif
 	const char *cp;