The silly buggers at realvnc.com don't seem to understand how command lines
work. As a transitional solution, I propose that vnc should accept either the
--longoption or -longoption forms interchangeably.

An easy way to do this is to check at the top of the string search against long
options, see if the arg pointer points to a string starting with "--", if so
advance it by one character, and then fall into the current checking code.

Obviously, this is not urgent. It just bugs me.