[PATCHes] Patches for OpenObex

Heya,

2 small patches for openobex.

The first patch fixes libusb1 compilation on my machine.

For the second patch, when libusb1 is used, we can set self->fd to be a
monitoring file descriptor for incoming data.

With that patch, I could make osso-gwobex work with USB connections.

There's still some bugs to take care of, but I believe this patch to be
correct. Are there any places in openobex where the self->fd will be
directly when connected via USB? If so, those would need to be fixed as
well.

Cheers