patch 8.2.0381: using freed memory with :lvimgrep and autocommand

Problem:    Using freed memory with :lvimgrep and autocommand. (extracted from
            POC by Dominique Pelle)
Solution:   Avoid deleting a dummy buffer used in a window. (closes #5777)
diff --git a/src/version.c b/src/version.c
index 2d5c134..e49c628 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    381,
+/**/
     380,
 /**/
     379,