meson: allow to build bluez support without libbluetooth
pulseaudio does not link against libbluetooth, as it's only talking to the bluez daemon over dbus. So the build dependency on libbluetooth is overly restrictive, as some embedded systems choose to ship without libbluetooth but still have bluez daemon support. This syncs the meson to the autotools configuration behavior by changing the bluez option to a default on boolean.
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