fix invalid conversion error with MinGW 4.8.1 in net.cpp #2826
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'const char_' [-fpermissive] in a setsockopt() call on Win32 that was
found by using MinGW 4.8.1 compiler suite
See http://msdn.microsoft.com/en-us/library/windows/desktop/ms740476%28v=vs.85%29.aspx to verify that Win32 needs a
const char *
.