Patch to make it more obvious when -l is needed

Attached, please find a patch to current SVN which adds a warning
message if no functions are found by xml2py, suggesting that maybe a
-l flag is needed.

It only changes the diagnostic output; no logic is affected.

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Index: ctypeslib/codegen/codegenerator.py
===================================================================
--- ctypeslib/codegen/codegenerator.py	(revision 87971)
+++ ctypeslib/codegen/codegenerator.py	(working copy)
@@ -813,6 +813,10 @@
         print >> stream, "# unknown variables:  %5d" % self._notfound_variables
         print >> stream, "#"
         print >> stream, "# Total symbols: %5d" % total
+        if self._functiontypes == 0:
+            print >> stream, "#"
+            print >> stream, "# No functions found: missing -l flag?"
+            print >> stream, "#"
         print >> stream, "###########################"
 
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