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This CL allows using protoc_convert with cross-compilation.

Change-Id: I20dd15a3ac56bed6deee2c66d0f09c2b9982c156
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1898070Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712627}