Bug#841431: apt-cacher-ng: FTBFS on mips/mipsel: undefined reference to '__atomic_fetch_add_8'

[Eduard Bloch]

Control: retitle 841431 FTBFS on m68k/powerpcspe
Control: reopen 841431

I wanted to extend this patch to a couple of other architectures and
failed to commit the change prior to release :-(

To be fixed in an upstream release soon.

Regards,
Eduard.