#1 configure option --nojoystick

[Arne Groh]

When configuring with the option --nojoystick compiling breaks in module robotgui:
robotgui.c: In function ‘read_robotgraph_parameters’:
robotgui.c:1154: error: ‘joy_device’ undeclared (first use in this function)
robotgui.c:1154: error: (Each undeclared identifier is reported only once
robotgui.c:1154: error: for each function it appears in.)