patch 8.1.0807: session test fails on MS-Windows

Problem:    Session test fails on MS-Windows.
Solution:   Don't try creating file with illegal name.
diff --git a/src/version.c b/src/version.c
index 509541d..da4b43c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -792,6 +792,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    807,
+/**/
     806,
 /**/
     805,