[patch] render-bugs relies on GNU find

[Richard Todd]

On my Mac OS X setup, I don't have GNU find.  render-bugs relies on the 
GNU find -printf extension, so autogen.sh fails when I run it.

I realize it's not hard to just get GNU find, but with the attached 
patch, render-bugs should produce identical output and work on more 
systems.

render-bugs.patch
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