* Use dpkg --print-architecture to determine the AFS sysname for both

* Use dpkg --print-architecture to determine the AFS sysname for both
  regular builds (avoiding --print-installation-architecture, which is
  deprecated) and kernel builds (avoiding arch, which is temporarily not
  in unstable and which wouldn't do the right thing for cross-compiles).
* Add hppa as a recognized architecture for kernel module builds,
  although OpenAFS currently only supports 2.4 kernels on HPPA so this
  isn't that useful.