patch 8.1.1121: test for term_gettitle() was disabled

Problem:    Test for term_gettitle() was disabled.
Solution:   Enable the test and bail out only when it doesn't work. (Dominique
            Pelle, closes #3776)
diff --git a/src/version.c b/src/version.c
index b3d7abc..1563e63 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1121,
+/**/
     1120,
 /**/
     1119,