Add missing cmath header - #468
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After llvm/llvm-project@ada3786, `#include <random>` does not imply `#include <cmath>`, so we need to directly import it to avoid breakages, e.g. due to the use of `std::round` in `basisu_transcoder_internal.h` or `std::fabs` in `basisu_backend.h`.
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When using libc++ after llvm/llvm-project@ada3786,
#include <random>does not imply#include <cmath>, so we need to directly import it to avoid breakages, e.g. due to the use ofstd::roundinbasisu_transcoder_internal.horstd::fabsinbasisu_backend.h.