Change prototype of drmIoctl to unsigned long request.

This resolves and issue on amd64 FreeBSD and it looks like the
linux ioctl syscall should be unsigned long as well.

Signed-off-by: Robert Noland <rnoland@2hip.net>

libdrm/xf86drm.c

@@ -175,7 +175,7 @@ static char *drmStrdup(const char *s)
  * Call ioctl, restarting if it is interupted
  */
 static int
-drmIoctl(int fd, int request, void *arg)
+drmIoctl(int fd, unsigned long request, void *arg)
 {
     int	ret;