Call Fl::args() to properly parse the "hidden" arguments that FLTK understands. ...

Call Fl::args() to properly parse the "hidden" arguments that FLTK understands.  This has two primary benefits:  (1) On X11 systems, you can now override the X display by passing '-display {display}' as the first argument, as is the case for most other X11 apps, and (2) on OS X, this allows the application to run within an application (.app) bundle, because Fl::args() parses the hidden arguments passed to the app by the launcher.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4525 3789f03b-4d11-0410-bbf8-ca57d06f2519