patch 9.1.0718: hard to know the users personal Vim Runtime Directory

Problem:  hard to guess the Vim Runtime Directory
Solution: Set the $MYVIMDIR environment variable to the users
          personal runtime directory (e.g. ~/.vim on Linux)

closes: #15576

Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    718,
 /**/
     717,
 /**/