patch 8.1.0947: using MSWIN before it is defined

Problem:    Using MSWIN before it is defined. (Cesar Romani)
Solution:   Move the block that uses MSWIN to below including vim.h. (Ken
            Takata)

src/version.c

@@ -779,6 +779,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    947,
 /**/
     946,
 /**/