FindBoost: Allow Boost::zlib and Boost::bzip2 targets on all platforms.

correarequested to merge
correa/cmake:correa-master-patch-51332 into master

When boost is built with BZIP2_SOURCE or ZLIB_SOURCE it will generate boost versions of these libraries. This allows Boost::zlib and Boost::bzip2 in target_link_libraries on all platforms not just Windows.

Topic-rename: FindBoost-zip-libs

Edited by Brad King

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