patch 8.0.1619: Win32 GUI: crash when winpty is not installed

Problem:    Win32 GUI: crash when winpty is not installed and trying to use
            :shell in a terminal window.
Solution:   Check for NULL return form term_start(). (Yasuhiro Matsumoto,
            closes #2727)

src/version.c

@@ -766,6 +766,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1619,
 /**/
     1618,
 /**/