GNU Autotools install doesn't place OggConfig.cmake in place

[ericoporto]

So the problem here is a package maintainer for a distro or some system may not use the CMake build when making their packages, and instead base their process on the Autotools or other build. When this happens, the OggConfig.cmake file will not be in place, and in turn using find_package in other CMake projects in such system won't work.

Also a new release with the recent CMake improvements would be welcome.