patch 8.1.0326: screen dump does not consider NUL and space equal

Problem:    Screen dump does not consider NUL and space equal.
Solution:   Use temp variables instead of character from cell.

src/version.c

@@ -794,6 +794,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    326,
 /**/
     325,
 /**/