Some distributions e.g. angstrom do not support gconf-dbus
anymore since its now provided by gconf and in oe-core we
have PREFERRED_PROVIDER_gconf tunable, here we replace all
dependencies on gconf-dbus with gconf, which should work
in both cases where poky defines
PREFERRED_PROVIDER-gconf = "gconf-dbus" and for angstrom
it is simply gconf
Without this meta-toolchain-sdk ends up with conflicts in
runqueue and does not build
