patch 8.1.1258: the "N files to edit" message can not be surpressed

Problem:    The "N files to edit" message can not be surpressed.
Solution:   Surpress the message with --not-a-term. (closes #4320)
diff --git a/src/version.c b/src/version.c
index e5582e9..69ab34b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1258,
+/**/
     1257,
 /**/
     1256,