Always set DIOBJECTDATAFORMAT.pguid to GUID_Button for joystick buttons

[Antonio Cuni]

At least one game (Pro Evolution Soccer 6) rely on the pguid field of 
the DIOBJECTDATAFORMAT struct to respond to joystick button's events. 
Setting pguid to GUID_Button solves the problem.

2007-09-20  Antonio Cuni <anto.cuni at gmail.com>

	* dlls/dinput/joystick_linux.c,
           dlls/dinput/joystick_linuxinput.c
	Always set DIOBJECTDATAFORMAT.pguid to GUID_Button for
         joystick buttons



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