OpenVPN plugin examples.Examples provided:simple.c -- using the --auth-user-pass-verify callback, verify            that the username/password is "foo"/"bar".To build:  ./build simple (Linux/BSD/etc.)  ./winbuild simple (MinGW on Windows)To use in OpenVPN, add to config file:  plugin simple.so (Linux/BSD/etc.)  plugin simple.dll (MinGW on Windows)