Small logger improvement: non-static helper functions

[Worldexe]

I suggest making static std::string KaldiGetStackTrace() and const char *GetProgramName() in base/kaldi-error.cc non-static (and add prototypes to header), so they can be used in custom log handlers just like they are used in default handler.

[kkm000]

The stack trace makes sense, but why GetProgramName? You set it, you get it back. I need to understand your motivation.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.