patch 8.2.0884: searchcount() test fails on slower systems

Problem:    Searchcount() test fails on slower systems.
Solution:   Set a longer timeout.
diff --git a/src/version.c b/src/version.c
index dff6cf9..7931e96 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    884,
+/**/
     883,
 /**/
     882,