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)
diff --git a/src/version.c b/src/version.c
index c5877df..50902d6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3870,
+/**/
     3869,
 /**/
     3868,