patch 9.1.0817: termdebug: cannot evaluate expr in a popup

Problem:  termdebug: cannot evaluate expr in a popup
Solution: enhance termdebug plugin and allow to evaluate expressions in
          a popup window, add a unit test (Peter Wolf).

fixes: #15877
closes: #15933

Signed-off-by: Peter Wolf <pwolf2310@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 4831281..90fc3b3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    817,
+/**/
     816,
 /**/
     815,