updated for version 7.3.268
Problem:    Vim freezes when executing an external command with zsh.
Solution:   Use O_NOCTTY both in the master and slave. (Bjorn Winckler)
diff --git a/src/version.c b/src/version.c
index 6bddff0..8adefc0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -710,6 +710,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    268,
+/**/
     267,
 /**/
     266,