Mingw compilation on Windows

[mbr4]

Under windows when compiling using Mingw there is a linking error:

\zeromq-4.1.6\builds\mingw32/../../src/session_base.cpp:520: undefined reference to `zmq::socks_connecter_t::socks_connecter_t(zmq::io_thread_t*, zmq::session_base_t*, zmq::options_t const&, zmq::address_t*, zmq::address_t*, bool)'
collect2.exe: error: ld returned 1 exit status
Makefile.mingw32:40: recipe for target 'libzmq.dll' failed
mingw32-make: *** [libzmq.dll] Error 1

This error is caoused by missing of 2 source files compilation in makefile. It can be fixed by adding two files:
socks_connecter.o socks.o
to Makefile.mingw32 to OBJS section.

[bluca]

Does it work on libzmq master?

[mbr4]

I just checked libzmq master and there is similar problem - missing files in makefile but files are different than in this issue, so I created another issue for the libzmq master (zeromq/libzmq#2194)

[bluca]

Thanks for checking. If you have a working fix, could you please send a PR? I don't have a Windows machine to test it myself, although someone else might.