updated for version 7.3.642

Problem:    Segfault with specific autocommands.  Was OK after 7.3.449 and
            before 7.3.545. (Richard Brown)
Solution:   Pass TRUE for abort_if_last in the call to close_buffer().
            (Christian Brabandt)

src/version.c

@@ -719,6 +719,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    642,
 /**/
     641,
 /**/