d4a9e334d3
Use the approach originally used in commit f91b3c1d (Add options to build with system utility libraries, 2006-10-19) for all other third-party libraries. Create a "cm_bzlib.h" header wrapper that robustly includes the header from the bzip2 library chosen for the CMake build (either builtin or system version). Include the header wrapper anywhere we need the API provided by <bzlib.h>.
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