pygobject3: Add missing dependencies (for darwin)
pygobject3: Add missing dependencies (for darwin)

The packages "which" and "ncurses" are needed for building pygobject3
(on darwin) during the checkPhase. The ncurses library is necessary only
because python3.5 is currently built using "-lncurses" and pygobject3
wants the same libraries that python3.5 was compiled with. (Because it
uses "python3.5-config --ldflags" during the build)

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