patch 8.0.1300: file permissions may end up wrong when writing

Problem:    File permissions may end up wrong when writing.
Solution:   Use fchmod() instead of chmod() when possible.  Don't truncate
            until we know we can change the file.

src/version.c

@@ -766,6 +766,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1300,
 /**/
     1299,
 /**/