1. since coap_add_option_later() has been removed, so remove
coap_add_option_later in lib-coap-2.(map,sym) and pdu.h
2. [PRNG] need include coap_prng.c into visual studio project too, since new
functions for generating pseudo numbers replace the old macro-based
approach.
3. [PRNG] need define coap_prng() coap_prng_init() coap_set_prng() for
windows too since these function are exported in lib-coap-2.(map,sym)
沈文武
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