patch 7.4.1020
Problem:    On MS-Windows there is no target to run tests with gvim.
Solution:   Add the testgvim target.
diff --git a/src/version.c b/src/version.c
index 70c54aa..a2eded5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1020,
+/**/
     1019,
 /**/
     1018,