Work around easylogging++ SIGSEGV on FreeBSD before main()

el::base::utils::s_currentHost/User/terminalSupportsColor are static std::string objects.  When built with gcc47 on FreeBSD-9, the ctors do not get called, and the app will SIGSEGV when initializing the default format strings.

Work around this by not caching the values in the static global objects.  For obfsclient, I don't use the format strings that are controled by these values anyway, and since I don't log to terminal, I can get away with just returning false.