dinput: Assign button GUID to joystick buttons.

[Vitaliy Margolen]

Fixes test. This is not documented but appears some programs relay on this.
---
  dlls/dinput/joystick_linux.c      |    1 +
  dlls/dinput/joystick_linuxinput.c |    1 +
  2 files changed, 2 insertions(+), 0 deletions(-)
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 7da792acd671816cb2a088d21030aa0c66584fc6.diff
Type: text/x-patch
Size: 1264 bytes
Desc: not available
Url : http://www.winehq.org/pipermail/wine-patches/attachments/20080412/db77d07f/attachment.bin