patch 8.1.2373: cannot build with +popupwin but without +quickfix

Problem:    Cannot build with +popupwin but without +quickfix. (John Marriott)
Solution:   Adjust #ifdefs.
diff --git a/src/testdir/test_gui.vim b/src/testdir/test_gui.vim
index 0f2a962..e3ec4aa 100644
--- a/src/testdir/test_gui.vim
+++ b/src/testdir/test_gui.vim
@@ -722,6 +722,8 @@
 endfunc
 
 func Test_menu()
+  CheckFeature quickfix
+
   " Check Help menu exists
   let help_menu = execute('menu Help')
   call assert_match('Overview', help_menu)