patch 8.1.2259: running tests may leave XfakeHOME behind

Problem:    Running tests may leave XfakeHOME behind.
Solution:   Source summarize.vim without using setup.vim. (closes #5177)
            Also fix that on MS-Windows the test log isn't echoed.
diff --git a/src/version.c b/src/version.c
index 464de12..0a210b6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2259,
+/**/
     2258,
 /**/
     2257,