MBEDTLS_NET_SOCKETS_H macro

\file net_sockets.h Network sockets abstraction layer to integrate Mbed TLS into a BSD-style sockets API. The network sockets module provides an example integration of the Mbed TLS library into a BSD sockets implementation. The module is intended to be an example of how Mbed TLS can be integrated into a networking stack, as well as to be Mbed TLS's network integration for its supported platforms. The module is intended only to be used with the Mbed TLS library and is not intended to be used by third party application software directly. The supported platforms are as follows: * Microsoft Windows and Windows CE * POSIX/Unix platforms including Linux, OS X