build: Drop outdated BlueZ conditional dependency checks
build: Drop outdated BlueZ conditional dependency checks

Since our overall EDS dependency is now higher than that needed for the
BlueZ backend, we can drop the conditional EDS version checks which
could previously disable building the BlueZ backend.

https://bugzilla.gnome.org/show_bug.cgi?id=743934

GNOME/folks,pwithnall/folks,pwithnall/folks,GNOME/folks,pwithnall/folks,GNOME/folks