[osg-submissions] Updates to Find* modules (syncing with CMake)

[Robert Osfield]

Thanks for the extra details.  Changes now merged and submitted to SVN.

BTW, how are things panning out with full OSX Xcode support with
CMake?  It would be great to be able to go with pure CMake build
system for 2.4, this will allow items like wrappers to automatically
work on all platforms as well as just reduce the long term  management
of the XCode projects.

Robert.