patch 8.2.0377: no CI test for a big-endian system

Problem:    No CI test for a big-endian system.
Solution:   Test with s390x. (James McCoy, closes #5772)
diff --git a/src/version.c b/src/version.c
index a1a4a88..1408142 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    377,
+/**/
     376,
 /**/
     375,