[PATCH xserver] config/udev: add input subsystem filter for udev events

[Mikhail Gusarov]

Twas brillig at 16:22:22 19.05.2011 UTC+08 when djkurtz at google.com did gyre and gimble:

 DK> libudev allows adding an efficient in-kernel filter on udev events.
 DK> Since we manually filter for ID_INPUT anyway, it seems reasonable to ask the kernel to send only events for the input subsystem.

 DK> This filtering is performed both for initial device enumeration, and for subsequent udev events.

 DK> Signed-off-by: Daniel Kurtz <djkurtz at google.com>

Reviewed-by: Mikhail Gusarov <dottedmag at dottedmag.net>

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