[codex] Select the V8 snapshot tool explicitly for cross-builds - #27324
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Why
A target-configured Windows
mksnapshotbinary cannot run on Linux remote executors, while Windows cross CI still needs the target-native generator because V8 snapshots embed target ABI details. Selecting the tool implicitly from the target OS cannot satisfy both environments.What changed
Add a V8 build flag that explicitly selects the target-configured snapshot tool. Host-native
mksnapshotremains the default for hermetic remote cross-builds, and the Windows cross CI configuration opts into the target tool while keeping the snapshot action local.Validation
just bazel-lock-checkThe complete remote release build is exercised by #27326.
Stack: 4 of 6. Depends on #27323.