Fix some C++ test dependencies

build.json

@@ -1280,6 +1280,7 @@
         "test/cpp/end2end/sync_client_async_server_test.cc"
       ],
       "deps": [
+        "grpc++_test_util",
         "grpc_test_util",
         "grpc++",
         "grpc",
@@ -1384,7 +1385,8 @@
       ],
       "deps": [
         "grpc++",
-        "grpc"
+        "grpc",
+	"gpr"
       ]
     },
     {
@@ -1396,7 +1398,8 @@
       ],
       "deps": [
         "grpc++",
-        "grpc"
+        "grpc",
+	"gpr"
       ]
     },
     {