docs: adopt the full cross-build guide (the tracked one was a stub)

The project root carried a 59 KB version of this guide, untracked, on one
disk. This repository carried 6.8 KB of it. Consolidation Phase 6 in the
Sylpheed repo.

Its audience line predates the decision to retire xenia-rs, so a note at the
top says to read 'audit oracle for the Rust port' as 'instrumented build for
RE'. The instructions themselves are unaffected -- clang-cl, xwin, lld-link
and Wine do not care why you want the binary.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Sylpheed RE agent
2026-09-13 21:18:30 +02:00
parent 8e63a95425
commit 99cc726626

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