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In the Postgres backend, we cannot link directly with libpq (check the pgsql-hackers arhive for all kinds of fun that ensued when we tried to do that). Therefore, the libpq functions are used through the thin wrapper functions in libpqwalreceiver.so, and libpqwalreceiver.so is loaded dynamically. To hide the dynamic loading and make the calls look like regular functions, we use macros to hide the function pointers. We had inherited the same indirections in libpqwalproposer, but it's not needed since the neon extension is already a shared library that's loaded dynamically. There's no problem calling the functions directly there. Remove the indirections.