Sail: fix Windows/Clang build

[dutow]

Summary

Changes to recipe: sail/*

Motivation

With the current recipe, debug builds fail with Clang on Windows because a MSVC specific condition.

Details

Fix: also handle clang in that condition.

---

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• Checked that this PR is not a duplicate: list of PRs by recipe
• Tested locally with at least one configuration using a recent version of Conan

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[jcar87]

Thanks @dutow - making that line unconditional in #25806, as it shouldn't have adverse effects on any compiler/platform. Closing this as the intended fix should already be part of 25806