[PATCH] Consistently use WITH_QTDBUS instead of USE_DBUS

[PATCH] Consistently use WITH_QTDBUS instead of USE_DBUS

USE_DBUS still uses an hardcoded list of architectures, whereas there
is already WITH_QTDBUS defined in case the D-Bus support is available.

Followup of commit 6bdab62068c89b61796246508813ae63aa3ef872.

Gbp-Pq: Name upstream_Consistently-use-WITH_QTDBUS-instead-of-USE_DBUS.patch