OpenVPN plugin examples.
 
 Examples provided:
 
 simple.c -- using the --auth-user-pass-verify callback,
             test deferred authentication.
 
 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)