Fix C library gpr_inf_future breakage

src/objective-c/GRPCClient/private/GRPCCompletionQueue.m

@@ -65,7 +65,8 @@
     dispatch_async(gDefaultConcurrentQueue, ^{
       while (YES) {
         // The following call blocks until an event is available.
-        grpc_event event = grpc_completion_queue_next(unmanagedQueue, gpr_inf_future);
+        grpc_event event = grpc_completion_queue_next(unmanagedQueue,
+                                                      gpr_inf_future(GPR_CLOCK_REALTIME));
         GRPCQueueCompletionHandler handler;
         switch (event.type) {
           case GRPC_OP_COMPLETE:

src/objective-c/GRPCClient/private/GRPCWrappedCall.m

@@ -246,8 +246,11 @@
     if (!_queue) {
       return nil;
     }
-    _call = grpc_channel_create_call(channel.unmanagedChannel, _queue.unmanagedQueue,
-                                     path.UTF8String, host.UTF8String, gpr_inf_future);
+    _call = grpc_channel_create_call(channel.unmanagedChannel,
+                                     _queue.unmanagedQueue,
+                                     path.UTF8String,
+                                     host.UTF8String,
+                                     gpr_inf_future(GPR_CLOCK_REALTIME));
     if (_call == NULL) {
       return nil;
     }