meson: Make room for C++-only warning flags for MSVC

Peter Eisentraut <peter@eisentraut.org>

Commit: 4c83f1253593ef46a0a190afb8ecead21f483196
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2026-03-31T06:42:22Z
meson: Make room for C++-only warning flags for MSVC

Refactor the MSVC warning option handling to have a list of common
flags and lists of flags specific to C and C++.

Reviewed-by: Jelte Fennema-Nio <postgres@jeltef.nl>
Discussion: https://www.postgresql.org/message-id/flat/CAGECzQR21OnnKiZO_1rLWO0-16kg1JBxnVq-wymYW0-_1cUNtg%40mail.gmail.com

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meson.build modified +23 −8

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