Linux: change protobuf default option to allow building

dbus/test_proto.proto

Index: dbus/test_proto.proto
diff --git a/dbus/test_proto.proto b/dbus/test_proto.proto
index 0a1d06f7ff51c46b7342d8b04a6ce4d2cf251bfb..2f5c154956c5e38823ee28a1e8f69da9026c3633 100644
--- a/dbus/test_proto.proto
+++ b/dbus/test_proto.proto
@@ -2,12 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-option optimize_for = LITE_RUNTIME;
-
 // This is a simple dummy protocol buffer that is used for testing handling of
 // protocol buffers in MessageReader and MessageWriter.
 
 message TestProto {
     optional string text = 1;
     optional int32 number = 2;
-}
+}