patch 8.2.3870: MS-Windows: wrong dir when using right-click context menu

Problem:    MS-Windows: wrong working directory when opening two files with
            right-click context menu. (Gabriel Dupras)
Solution:   Use the working directory and pass it on to the process creation.
            (Nir Lichtman, closes #9382, closes #8874)

src/version.c

@@ -749,6 +749,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3870,
 /**/
     3869,
 /**/