OLPC XO-1.5 - fixed build problem introduced by Bluetooth driver.
The problem is that the bluetooth driver uses some Forth words
that don't have FCode equivalents, but the WLAN driver stack is
in FCode form on XO-1.5. The easy fix is to omit the bluetooth
driver for XO-1.5. As a result, if you try to use an 8787 module
in an XO-1.5, the Bluetooth diagnostic won't work. That doesn't
violate any known use case, since the BT diag's purpose is factory
testing of XO-4s.