[gupnp] introspection caching

Hey Jorn!
   Attaching the patch for caching of introspection object. You'll
notice that the format of the patch is quite different from the output
of `svn diff` since it's the output of `git-format-patch` but that
shouldn't change anything other than that you'll have to update the
ChangeLog yourself, you can get the log message from the Subject line
in the patch.

-- 
Regards,
Zeeshan Ali
FSF member#5124

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