lwip: Fix compatibility issues with later versions
The name of the header guard in lwIP's <lwip/opt.h> has changed from '__LWIP_OPT_H__' to 'LWIP_HDR_OPT_H' (bug #35874 in May 2015). Other fixes: - In curl_setup.h, the problem with an old PSDK doesn't apply if lwIP is used. - In memdebug.h, the 'socket' should be undefined first due to lwIP's lwip_socket() macro. - In curl_addrinfo.c lwIP's getaddrinfo() + freeaddrinfo() macros need special handling because they were undef'ed in memdebug.h. - In select.c we can't use preprocessor conditionals inside select if MSVC and select is a macro, as it is with lwIP. http://curl.haxx.se/mail/lib-2015-12/0023.html http://curl.haxx.se/mail/lib-2015-12/0024.html
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