Modified in_addr6 cast in CConman class to work with msvc #13672

Fix to allow net.cpp to compile with MSVC. Without this fix the (in6_addr)IN6ADDR_ANY_INIT implicit cast generates a compilation error.

Looks like this breaks everything but the Windows builds. Linux:

net.cpp: In member function 'bool CConnman::InitBinds(const std::vector<CService>&, const std::vector<CService>&)':
net.cpp:2257:25: error: variable 'CConnman::InitBinds(const std::vector<CService>&, const std::vector<CService>&)::in_addr6 inaddr6_any' has initializer but incomplete type
         struct in_addr6 inaddr6_any = IN6ADDR_ANY_INIT;
                         ^~~~~~~~~~~
make[2]: *** [libbitcoin_server_a-net.o] Error 1
Makefile:5954: recipe for target 'libbitcoin_server_a-net.o' failed

macOS:

libbitcoin_server_a-net.o `test -f 'net.cpp' || echo './'`net.cpp
net.cpp:2257:25: error: variable has incomplete type 'struct in_addr6'
        struct in_addr6 inaddr6_any = IN6ADDR_ANY_INIT;
                        ^
net.cpp:2257:16: note: forward declaration of 'in_addr6'
        struct in_addr6 inaddr6_any = IN6ADDR_ANY_INIT;
               ^
1 error generated.
make[2]: *** [libbitcoin_server_a-net.o] Error 1
Makefile:5954: recipe for target 'libbitcoin_server_a-net.o' failed

Back to the drawing board then. I'll try and find an approach that works on Linux as well as Windows.

@sipsorcery #ifndef WIN32?

Looks like just a missing include for in6_addr?

@sipa the includes are good. The compilation error is:

Error C4576 a parenthesized type followed by an initializer list is a non-standard explicit type conversion syntax libbitcoin_server c:\dev\github\bitcoin-msvc\src\net.cpp 2258

The define on Windows (ws2ipdef.h) is:

#define IN6ADDR_ANY_INIT {{{ 0 }}}

@sipsorcery I mean the build error in this PR looks like in6_addr is not defined.

Alternatively, maybe "inaddr6_any" is a macro on some platforms? Try another variable name.

So looks like in_addr6 for MSVC, in6_addr for gcc

MSVC also uses in6_addr (there is an extra in_addr6 alias that I inadvertently used). I'll adjust the PR.

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