SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER

Make it possible to retry SSL_write() with changed buffer location (buffer contents must stay the same!); this is not the default to avoid the misconception that non-blocking SSL_write() behaves like non-blocking write():

extern (C) nothrow @nogc
enum SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER = 0x00000002L;

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