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_compiler.vim b/src/testdir/test_compiler.vim
index 6bb6027..1ce2718 100644
--- a/src/testdir/test_compiler.vim
+++ b/src/testdir/test_compiler.vim
@@ -1,9 +1,12 @@
 " Test the :compiler command
 
+source check.vim
+
 func Test_compiler()
   if !executable('perl')
     return
   endif
+  CheckFeature quickfix
 
   " $LANG changes the output of Perl.
   if $LANG != ''