improve handling of third-party dependencies in CMake #391
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Adds two additional
BLOATY_PREFER_SYSTEM_*options to control how protobuf and re2 are sourced. Defauts are set toYESto preserve existing workflows.Also lazy-initializes git submodules only when they are required. Previously the build was always cloning submodules even if the system install was selected, which slowed the CMake configure step down quite a bit in some cases.