patch 9.0.2064: cannot use buffer-number for errorformat

Problem:  cannot use buffer-number for errorformat
Solution: add support for parsing a buffer number using '%b' in
          'errorformat'

closes: #13419

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>
diff --git a/src/version.c b/src/version.c
index 3389927..7651bcc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2064,
+/**/
     2063,
 /**/
     2062,