patch 7.4.1641

Problem:    Using unterminated string.
Solution:   Add NUL before calling vim_strsave_shellescape(). (James McCoy)

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1641,
 /**/
     1640,
 /**/