Fix Linux build failure with std::logf

[daijh]

The function logf is defined in "math.h". Removing the std:: namespace prefix resolves compilation errors experienced on Linux builds.

[daijh]

It can be reproduced on both v0.8.0 and main.

Build

git checkout v0.8.0

bazelisk build --config=linux --define=litert_link_capi_so=true --define=resolve_symbols_in_exec=false //runtime/engine:litert_lm_main

Log

runtime/components/preprocessor/audio_preprocessor_miniaudio.cc:210:20: error: no member named 'logf' in namespace 'std'; did you mean simply 'logf'?
210 | std::max(std::logf(tmp_log_mel[j]), config_.GetMelFloor());
| ^~~~~~~~~
| logf

[daijh]

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