ghostscript: add patches for CVE-2019-10216, CVE-2019-14811, CVE-2019-14812, CVE-2019-14813 and most of CVE-2019-14817
ghostscript: add patches for CVE-2019-10216, CVE-2019-14811, CVE-2019-14812, CVE-2019-14813 and most of CVE-2019-14817

the latter's patch is only partially applied because it doesn't apply
cleanly to 9.27, still the fixes that do apply work and are better than
nothing

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