testpb: add syntax declaration to proto file

bradfitz · bradfitz · commit 4eab30f13db9 · 2016-02-11T14:59:07.000-08:00
Required for Google's internal build system.
diff --git a/testpb/test.proto b/testpb/test.proto
@@ -14,6 +14,8 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+syntax = "proto2";
+
 package testpb;
 
 message TestMessage {
