[cmake-developers] SelectLibraryConfigurations cached/advanced variables

[Daniele E. Domenichelli]

Hello,

Now that SelectLibraryConfigurations is good enough for me, I updated
FindGTK2.cmake to use it. I pushed my changes in a FindGTK2Debug topic,
does anyone want to review them before I merge the changes to next?

Thanks,

Cheers,
 Daniele