patch 8.2.0060: message test only runs with one encoding

Problem:    Message test only runs with one encoding. (Dominique Pelle)
Solution:   Run the test with "utf-8" and "latin1".  Fix underflow. (related
            to #5410)
diff --git a/src/version.c b/src/version.c
index aeb1920..3a22ca4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    60,
+/**/
     59,
 /**/
     58,