<feat>: Add android logcat support.

[waterdropw]

debug log will disapear if it's called in android app, so this PR add logcat instead of printf.

[bobqianic]

To be honest, I'm not convinced that including <android/log.h> in whisper.cpp is the best approach. It seems more practical to use a callback instead.

I'm also wondering why do we continue to use WHISPER_PRINT_DEBUG when we already have WHISPER_LOG? Couldn't we just create a function named WHISPER_LOG_DEBUG that offers both console output and callback functionality? @ggerganov

[waterdropw]

Well, I see the callback logic just now, I agree with you, it's the right way!

[ggerganov]

Yup, logcat is better to not be part of whisper.cpp - utilize the log callback

Regarding WHISPER_PRINT_DEBUG - it's used for debugging that I don't think will be really useful to the "outside world". But we could add WHISPER_LOG_DEBUG instead for consistency. Probably have to extend enum ggml_log_level with new GGML_LOG_LEVEL_DEBUG value

[bobqianic]

I am now closing this PR because you can now use a callback to get all the log information, including DEBUG.