patch 8.0.1345: race condition between stat() and open() for viminfo

Problem:    Race condition between stat() and open() for the viminfo temp
            file. (Simon Ruderich)
Solution:   use open() with O_EXCL to atomically check if the file exists.
            Don't try using a temp file, renaming it will fail anyway.

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1345,
 /**/
     1344,
 /**/