patch 9.0.0034: spell tests do not always clear the word list

Problem:    Spell tests do not always clear the word list.
Solution:   Clear the word list in TearDown(). (closes #10659)

src/version.c

@@ -735,6 +735,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    34,
 /**/
     33,
 /**/