patch 8.2.4879: screendump test may fail when using valgrind

Problem:    Screendump test may fail when using valgrind.
Solution:   Wait longer for the first screendump.
diff --git a/src/version.c b/src/version.c
index 30f420b..5a597a8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4879,
+/**/
     4878,
 /**/
     4877,