Switch to side-by-side view

--- a/Makefile.am
+++ b/Makefile.am
@@ -110,8 +110,7 @@
     libupnpp/soaphelp.hxx \
     libupnpp/upnpavutils.hxx \
     libupnpp/upnpplib.hxx \
-    libupnpp/upnpputils.hxx \
-    libupnpp/workqueue.h
+    libupnpp/upnpputils.hxx
 
 EXTRA_DIST = autogen.sh