patch 8.2.5156: search timeout test often fails with FreeBSD

Problem:    Search timeout test often fails with FreeBSD.
Solution:   Double the maximum time.
diff --git a/src/version.c b/src/version.c
index 4f9d891..b13e4ce 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    5156,
+/**/
     5155,
 /**/
     5154,