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We recently changed the chrome build so that nacl binaries of both 32 and 64
bit type are not built unless needed.
The sdk had assumed both arches are built as a side effect.

Building both arches in the sdk.

BUG=None
TEST=local
R=binji@chromium.org

Review URL: https://codereview.chromium.org/590523002

Cr-Commit-Position: refs/heads/master@{#296240}