patch 8.1.1234: swap file test fails on MS-Windows

Problem:    Swap file test fails on MS-Windows.
Solution:   Only compare the tail of the file names.
diff --git a/src/version.c b/src/version.c
index 48aa464..c082c06 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1234,
+/**/
     1233,
 /**/
     1232,