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)

src/version.c

@@ -709,6 +709,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    268,
 /**/
     267,
 /**/