patch 8.1.0468: MS-Windows: filter command with pipe character fails

Problem:    MS-Windows: Filter command with pipe character fails. (Johannes
            Riecken)
Solution:   Find the pipe character outside of quotes. (Yasuhiro Matsumoto,
            closes #1743, closes #3523)
diff --git a/src/version.c b/src/version.c
index def449a..d4cccb9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    468,
+/**/
     467,
 /**/
     466,