packaging: fix path where .deb files are looked for

In builddeb script, the path where .deb files are looked for should
simply be $OUTPUTDIR since the previous instruction moves those files
there.

This fixes "make deb".

contrib/packaging/builddeb

@@ -111,5 +111,5 b' if [ "$CLEANUP" ] ; then'
           -type f -newer $control -print0 2>/dev/null | \
       xargs -Inarf -0 mv narf "$OUTPUTDIR"
     echo "Built packages for $debver:"
-    find "$PWD"/"$OUTPUTDIR" -type f -newer $control -name '*.deb'
+    find "$OUTPUTDIR" -type f -newer $control -name '*.deb'
 fi