pius: perl should be a runtime dependency, not a build-time one
pius: perl should be a runtime dependency, not a build-time one

Since 61bc03c017f18e2fe54d209ae8ba8a42033b9564, patch-shebangs
now distinguishes between build-time and runtime dependencies.

Prior to this commit, perl was not being placed in patch-shebangs'
search path when it is run during the fixup phase.

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