update qcloud sdk

1. iot-hub sdk update to 3.2.0
2. iot-explorer update to 3.1.1

components/connectivity/qcloud-iot-hub-sdk/3rdparty/include/platform.h

@@ -0,0 +1,51 @@
+/*
+ * Tencent is pleased to support the open source community by making IoT Hub available.
+ * Copyright (C) 2018-2020 THL A29 Limited, a Tencent company. All rights reserved.
+
+ * Licensed under the MIT License (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://opensource.org/licenses/MIT
+
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is
+ * distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef PLATFORM_H_
+#define PLATFORM_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define PATH_MAX 4096
+/* Max size of cert/key file full path */
+#define FILE_PATH_MAX_LEN 256
+
+#ifdef WIN32
+#include <Windows.h>
+#include <direct.h>
+#include <limits.h>
+#include <process.h>
+typedef unsigned long ssize_t;
+#define getcwd(buffer, len) _getcwd(buffer, len)
+#endif
+
+#if defined(__linux__) && defined(__GLIBC__)
+#include <assert.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <pthread.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PLATFORM_H_ */