patch 8.0.1348: make testclean deletes script file on MS-Windows

Problem:    Make testclean deletes script file on MS-Windows.
Solution:   Rename file to avoid it starting with an "x".
diff --git a/src/version.c b/src/version.c
index f5ad775..8f0625d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1348,
+/**/
     1347,
 /**/
     1346,