patch 8.0.0685: when conversion fails written file may be truncated

Problem:    When making backups is disabled and conversion with iconv fails
            the written file is truncated. (Luo Chen)
Solution:   First try converting the file and write the file only when it did
            not fail. (partly by Christian Brabandt)

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    685,
 /**/
     684,
 /**/