SDL port override

[Matthew Dillon]

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:SDL was not recognizing dragonfly in the configure script because of the
:dev/usb -> bus/usb change.  This patches configure to build the bsd subdir
:in joystick, and makes the change ins src/joystick/bsd so it now defines 
:these symbols.  zsnes now builds and works fine.  My USB gamepad does not
:work with zsnes, but it allows it to build and work with keyboard control
:
:-Craig
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:Craig Dooley                                            craig at xxxxxxxxxx
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    Committed.  Thanks Craig.

						-Matt