test/test_protocol: add missing unistd.h include
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#include <cppunit/ui/text/TestRunner.h>
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#include <cppunit/ui/text/TestRunner.h>
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#include <cppunit/extensions/HelperMacros.h>
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#include <cppunit/extensions/HelperMacros.h>
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#include <unistd.h>
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static enum ack last_error = ack(-1);
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static enum ack last_error = ack(-1);
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void
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void
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