patch 9.1.1346: missing out-of-memory check in textformat.c

Problem:  missing out-of-memory check in textformat.c
Solution: add out-of-memory check, add small optimizations to
          internal_format() and same_leader() (John Marriott)

closes: #17200

Signed-off-by: John Marriott <basilisk@internode.on.net>
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 */
+/**/
+    1346,
 /**/
     1345,
 /**/