maco_optional_find_package magic

[Jeff Mitchell]

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Can someone clue me in as to how macro_optional_find_package manages to
not have the configure abort (at the end) if the package isn't found?  I
thought it might be something in KDE4Defaults, but didn't find it in
there either.

I need to do a check before I add the KDE4 includes/find_package, so I
can't use the macro (because I can't rely on KDE4 being installed)...but
if I take the macro's code and paste it into my CMakeLists.txt, it
doesn't behave the same (I'm not using REQUIRED).

Thanks,
Jeff
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