patch 7.4.1669

Problem:    When writing buffer lines to a pipe Vim may block.
Solution:   Avoid blocking, write more lines later.

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1669,
 /**/
     1668,
 /**/