fix(omnivoice-codec): make main_impl static to satisfy -Wmissing-declarations

[lalalune]

Follow-up to PR #23.

tools/omnivoice/tools/omnivoice-codec.cpp:158 defines int main_impl(int, char**) at file scope without prior declaration. Under -DLLAMA_FATAL_WARNINGS=ON (CI 3rd-party / ubuntu-24-llguidance) this fails:

tools/omnivoice/tools/omnivoice-codec.cpp:158:5: error: no previous declaration for 'int main_impl(int, char**)' [-Werror=missing-declarations]

The sibling tool omnivoice-tts.cpp already marks its main_impl static (line 411). Match it.

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