client: Depend on compat
client: Depend on compat

The upcoming https://codereview.chromium.org/1513573005/ requires that
std::move() in compat be available to callers in client.

crashpad_client_mac.cc uses macros not available in all SDK versions.

R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/1510243002 .

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