The C-preprocessor in Visual-C (even in MSVC 2015) is pretty
lame compared to Gnu-C. In select.c (around line 317 and 523):

    r = select((int)maxfd + 1,
#ifndef USE_WINSOCK
               &fds_read,
               &fds_write,
#else
               fds_read.fd_count ? &fds_read : NULL,
               fds_write.fd_count ? &fds_write : NULL,
#endif
               &fds_err, ptimeout);

this causes lots of parse errors since with USE_LWIPSOCK, select() is a
macro (-> lwip_select()). And MSVC doesn't like a '#' inside macros.

The attached patch reverses the logic. IMHO '#ifdef USE_WINSOCK' is more
readable than '#ifndef USE_WINSOCK'.

-- 
--gv

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