patch 7.4.710
Problem:    It is not possible to make spaces visibible in list mode.
Solution:   Add the "space" item to 'listchars'. (David Bürgin, issue 350)
diff --git a/src/globals.h b/src/globals.h
index 759c510..f0879dc 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -1163,6 +1163,7 @@
 EXTERN int	lcs_ext INIT(= NUL);
 EXTERN int	lcs_prec INIT(= NUL);
 EXTERN int	lcs_nbsp INIT(= NUL);
+EXTERN int	lcs_space INIT(= NUL);
 EXTERN int	lcs_tab1 INIT(= NUL);
 EXTERN int	lcs_tab2 INIT(= NUL);
 EXTERN int	lcs_trail INIT(= NUL);