patch 8.0.0693: no terminal emulator support

Problem:    No terminal emulator support.  Cannot properly run commands in the
            GUI.  Cannot run a job interactively with an ssh connection.
Solution:   Very early implementation of the :terminal command.  Includes
            libvterm converted to ANSI C.  Many parts still missing.
diff --git a/src/option.h b/src/option.h
index 2c6aeef..69fc348 100644
--- a/src/option.h
+++ b/src/option.h
@@ -1130,6 +1130,9 @@
     , WV_COCU
     , WV_COLE
 #endif
+#ifdef FEAT_TERMINAL
+    , WV_TMS
+#endif
 #ifdef FEAT_CURSORBIND
     , WV_CRBIND
 #endif