headerscheck: Document that --with-llvm is required

Peter Eisentraut <peter@eisentraut.org>

Commit: f5d07085822a144afb169d0f422e25689cb6209f
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2025-08-29T07:30:50Z
headerscheck: Document that --with-llvm is required

We already documented that other --with-* options are required for a
successful run.  It turns out --with-llvm is also required.

Suggested-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/1127775.1754417387%40sss.pgh.pa.us

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src/tools/pginclude/README modified +12 −4

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