bistro.inc: add bluez5 to DISTRO_FEATURES
bistro.inc: add bluez5 to DISTRO_FEATURES

There's finally a standardized way of handling bluez4 vs bluez5, so
let's use that. See poky/meta/classes/bluetooth.bbclass for more info.

Pelagicore/meta-bistro,Pelagicore/meta-bistro,frznlogic/meta-bistro,jonte/meta-bistro,jonte/meta-bistro,thenor/meta-bistro,frznlogic/meta-bistro,thenor/meta-bistro,GordanM/meta-bistro,socec/meta-bistro,GordanM/meta-bistro,socec/meta-bistro,Pelagicore/meta-bistro,frznlogic/meta-bistro,jonte/meta-bistro,socec/meta-bistro,socec/meta-bistro,thenor/meta-bistro,GordanM/meta-bistro,Pelagicore/meta-bistro,thenor/meta-bistro,Pelagicore/meta-bistro,Pelagicore/meta-bistro,frznlogic/meta-bistro,thenor/meta-bistro,jonte/meta-bistro,thenor/meta-bistro