patch 9.1.0838: vimtutor is bash-specific

Problem:  vimtutor is bash-specific (after 17c71daf83)
Solution: port back to POSIX sh (Aliaksei Budavei).

Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    838,
 /**/
     837,
 /**/