patch 8.1.0142: xterm and vt320 builtin termcap missing keypad keys

Problem:    Xterm and vt320 builtin termcap missing keypad keys.
Solution:   Add the escape sequences. (Kouichi Iwamoto, closes #2973)
diff --git a/src/version.c b/src/version.c
index ff1297a..8efe57e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -790,6 +790,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    142,
+/**/
     141,
 /**/
     140,