patch 8.0.1267: Test_swap_group may leave file behind

Problem:    Test_swap_group may leave file behind.
Solution:   Add a try/finally.
diff --git a/src/version.c b/src/version.c
index 81f5fc3..0fb6952 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1267,
+/**/
     1266,
 /**/
     1265,