rustdesk 1.5.0 moved VCPKG_COMMIT_ID in flutter-build.yml from 120deac
to 9e593bb (vcpkg, 2026-07-30), and _prepare_vc stops the build when the
recipe's pin differs. Add the 1.5.0 row to the vcpkg table and the new
archive's checksums. Flutter 3.24.5, Rust 1.75 and the README's vcpkg
library list are unchanged from 1.4.9.