Treat Debian arch "armhf" as being for CPU type "armv6l"

I'm not sure if this is correct, but it makes it work on the Raspberry
Pi. "armhf" means hard-float (i.e. the package may assume a hardware
FP unit). "armv6l" means the v6 instruction set (used on the ARM11
processor), little-endian.
Release 2.6
Start development series 2.6-post