Fix log messages on stderr (info) bleeding into stdout

[ankurvdev]

While using llama-mtmd-cli some of the messages bleed into the output which prevents redirecting the actual output from the model into a file

This happens because the standard logging macros were not in sync with the rest of the project.

The fix makes sure the common log.h that defines the macros is used and removes the overridden declaration

Make sure to read the contributing guidelines before submitting a PR

[ngxson]

mtmd_helper is not expected to linked against libcommon, we cannot include log.h here

[ankurvdev]

Can you give me a little background as to why or point me to a discussion with the details.

The problem this PR solves is annoying enough that I'd like to fix it but not sure what the right fix here is without knowing what the underlying reason for avoiding libcommon are.

[ngxson]

mtmd-helper is suppose to be a demo to show how mtmd can interact directly with libllama. Linking against libcommon make it impossible to reuse the code in downstream projects.

[ankurvdev]

Thanks for the context.

Wondering then if its ok to create a global logging_func variable in the mtmd library that defaults to fprintf but can be overriden to point to libcommon funcs inside the llama-mtmd-cli

The llama-mtmd-cli seems to link to libcommon so hopefully that should work.

Might be useful to other users of mtmd to plug in their loggers as well.

How does that sound?

[ankurvdev]

I pushed an updated commit to show what I meant and check if this looks acceptable