openafs_1_8: Cleanup build and fix build issues
openafs_1_8: Cleanup build and fix build issues

Parallel building is broken, leading to failing builds in very rare
cases. (volint.h not yet built while alredy needed when compiling volser.)

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs