adbd: avoid compiling more code in the daemon.

Strip out more code that has no meaning on device, to "improve"
coverage.

Test: test_device.py over TCP
Change-Id: Id8d9fa6cc6c6c30773f67303bcc89e6d60824700
diff --git a/transport_test.cpp b/transport_test.cpp
index a9ada4a..8579ff4 100644
--- a/transport_test.cpp
+++ b/transport_test.cpp
@@ -127,6 +127,7 @@
     ASSERT_EQ(std::string("baz"), t.device);
 }
 
+#if ADB_HOST
 TEST_F(TransportTest, test_matches_target) {
     std::string serial = "foo";
     std::string devpath = "/path/to/bar";
@@ -183,3 +184,4 @@
         EXPECT_FALSE(t.MatchesTarget("abc:100.100.100.100"));
     }
 }
+#endif