Require protobuf for build flags
This change forces build flags from .scl to .textproto format. Bug: 328495189 Bug: 338450506 Test: manual, TH Merged-In: Ia33aae158d62c12666d97449cea0c02b60550a21 Change-Id: Ia33aae158d62c12666d97449cea0c02b60550a21
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