patch 9.1.1248: compile error when building without FEAT_QUICKFIX

Problem:  compile error when building without FEAT_QUICKFIX
Solution: adjust ifdefs in popupwin.c, add CheckFeature quickfix
          to a few tests (John Marriott, Hirohito Higashi)

closes: #16940
closes: #16962

Co-authored-by: Hirohito Higashi <h.east.727@gmail.com>
Co-authored-by: Zoltan Arpadffy <zoltan.arpadffy@gmail.com>
Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: John Marriott <basilisk@internode.on.net>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_vim9_disassemble.vim b/src/testdir/test_vim9_disassemble.vim
index 4877933..e98ab75 100644
--- a/src/testdir/test_vim9_disassemble.vim
+++ b/src/testdir/test_vim9_disassemble.vim
@@ -243,6 +243,7 @@
 enddef
 
 def Test_disassemble_cexpr()
+  CheckFeature quickfix
   var res = execute('disass s:Cexpr')
   assert_match('<SNR>\d*_Cexpr.*' ..
         ' var errors = "list of errors"\_s*' ..