xkb: Store the action filters per device in the XkbSrvInfoRec.

Using a global array for action filters is bad. If two keyboard hit a modifier
at the same time, releaseing the first one will deactivate the filter and
thus the second keyboard can never release the modifier again.
(cherry picked from commit bfe6b4d2d9)

include/xkbsrv.h

@@ -126,6 +126,24 @@ typedef struct	_XkbEventCause {
 #define	_BEEP_LED_CHANGE	14
 #define	_BEEP_BOUNCE_REJECT	15
 
+struct _XkbSrvInfo; /* definition see below */
+
+typedef struct _XkbFilter {
+	CARD16			  keycode;
+	CARD8			  what;
+	CARD8			  active;
+	CARD8			  filterOthers;
+	CARD32			  priv;
+	XkbAction		  upAction;
+	int			(*filter)(
+					struct _XkbSrvInfo* 	/* xkbi */,
+					struct _XkbFilter *	/* filter */,
+					unsigned		/* keycode */,
+					XkbAction *		/* action */
+				  );
+	struct _XkbFilter	 *next;
+} XkbFilterRec,*XkbFilterPtr;
+
 typedef struct _XkbSrvInfo {
 	XkbStateRec	 prev_state;
 	XkbStateRec	 state;
@@ -169,6 +187,9 @@ typedef struct _XkbSrvInfo {
 	OsTimerPtr	 bounceKeysTimer;
 	OsTimerPtr	 repeatKeyTimer;
 	OsTimerPtr	 krgTimer;
+
+	int		 szFilters;
+	XkbFilterPtr	 filters;
 } XkbSrvInfoRec, *XkbSrvInfoPtr;
 
 #define	XkbSLI_IsDefault	(1L<<0)