patch 8.1.2079: popup window test fails without +terminal

Problem:    Popup window test fails without +terminal.
Solution:   Check for the +terminal feature.
diff --git a/src/version.c b/src/version.c
index af7ee23..f7d7ede 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2079,
+/**/
     2078,
 /**/
     2077,