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/testdir/test_popupwin.vim b/src/testdir/test_popupwin.vim
index dfdfc13..b9d6d83 100644
--- a/src/testdir/test_popupwin.vim
+++ b/src/testdir/test_popupwin.vim
@@ -1993,6 +1993,8 @@
 endfunc
 
 func Test_popupwin_terminal_buffer()
+  CheckFeature terminal
+
   let ptybuf = term_start(&shell, #{hidden: 1})
   call assert_fails('let winnr = popup_create(ptybuf, #{})', 'E278:')
   exe 'bwipe! ' .. ptybuf
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,