In zone.c, use __func__ instead of hand-crafted me strings

Ondřej Surý requested to merge ondrej-zone.c-refactor-me-into-__func__ into main

In zone.c, the "me" strings were defined for functions that could be traced with "ENTER" macro.

Use the func that's defined by the compiler and is less prone to copy&paste errors.

Edited by Ondřej Surý

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