patch 9.0.0856: MS-Windows: executable not found when running test

Problem:    MS-Windows: executable not found when running individual test.
Solution:   Also look for vimd.exe. (Christopher Plewright, closes #11525)

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    856,
 /**/
     855,
 /**/