patch 7.4.730

Problem:    When setting the crypt key and using a swap file, text may be
            encrypted twice or unencrypted text remains in the swap file.
            (Issue 369)
Solution:   Call ml_preserve() before re-encrypting.  Set correct index for
            next pointer block.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    730,
 /**/
     729,
 /**/