Download googlebenchmark if not found #1709
Merged
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Currently building with
-DSPDLOG_BUILD_ALL=1
fails if googlebench is not installed on the user system (becausebench
depends on googlebench). CMake FetchContent can be used to download and build it (also test it, but I disabled that option) so that the bench build doesn't fail. FetchContent is however only available on CMake 3.11+, hence the hacky version check.Obviously, the cleaner solution is to bump CMake minimum to 3.11, but I didn't change that because #1624