extended the GNUNET_OS_check_helper_binary parameters to do previlege

extended the GNUNET_OS_check_helper_binary parameters to do previlege
checking in windows. To do so, tested binaries must still be supplied
with valid commandline arguments, but on windows gnunet will utilize the
-d flag to run the programs initialization phase or privileged
operations only. In these modes, a program will not enter its mainloop
or communicate with the outside.

updated relevant function calls gnunet-wide to meet the extended
function parameters.