[C++] rename the Thread/Mutex to cxx_Thread/Mutex to avoid same name issue

components/cplusplus/cxx_crt.cpp

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+* Change Logs:
+* Date           Author       Notes
+* 2015-03-07     Bernard      Add copyright header.
+*/
+
+#include <rtthread.h>
+#include "crt.h"
+
+void *operator new(size_t size)
+{
+    return rt_malloc(size);
+}
+
+void *operator new[](size_t size)
+{
+    return rt_malloc(size);
+}
+
+void operator delete(void *ptr)
+{
+    rt_free(ptr);
+}
+
+void operator delete[](void *ptr)
+{
+    return rt_free(ptr);
+}
+
+void __cxa_pure_virtual(void)
+{
+    rt_kprintf("Illegal to call a pure virtual function.\n");
+}