According to the upstream developers of dbus, cmake is only inteded for
windows. Unix like operating systems should continue to use the
autotools stack.

Since the changeover to cmake, the dbus was no longer usable on all big
endian systems because the name binding no longer worked.

In cmake, it is not evaluated whether it should run on a little endian
or big endian system.

This fixes issue #17780. The original problem occurred when using the
modem manager on the big endian system (MIPS).

Signed-off-by: Florian Eckert <fe@dev.tdt.de>