cups-filters: broken build from poppler_utils update

[calvertvl]

Issue description

cups-filters fails to build on recent master (333a664)

Reverting the recent poppler_utils update (7d01650) resolves the problem, and cups-filters builds properly again. This was PR #43915.

Steps to reproduce

Failure: nix-build -A cups-filters

  CC       gstoraster-gstoraster.o
  CC       mupdftoraster-mupdftoraster.o
  CC       foomatic_rip-foomaticrip.o
  CC       foomatic_rip-options.o
  CC       foomatic_rip-pdf.o
  CC       foomatic_rip-postscript.o
  CC       foomatic_rip-process.o
  CC       foomatic_rip-renderer.o
filter/pdf.cxx: In function 'int pdf_fill_form(pdf_t*, opt_t*)':
filter/pdf.cxx:740:44: error: invalid conversion from 'const GooString*' to 'GooString*' [-fpermissive]
             field_name = ff->getPartialName();
                          ~~~~~~~~~~~~~~~~~~^~
make[1]: *** [Makefile:3937: bannertopdf-pdf.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory '/build/cups-filters-1.20.4'
make: *** [Makefile:1975: all] Error 2
builder for '/nix/store/bshxw2d6zg5cw134nv5zch9favrn7gqp-cups-filters-1.20.4.drv' failed with exit code 2
error: build of '/nix/store/bshxw2d6zg5cw134nv5zch9favrn7gqp-cups-filters-1.20.4.drv' failed

Success: git revert 7d016502d88a89bebb2fd8728a5bb40702a7feba && nix-build -A cups_filters

Technical details

• system: "x86_64-linux"
• host os: Linux 4.14.58, NixOS, 18.09.git.f134990 (Jellyfish)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.0.4
• channels(root): "nixos-17.09pre104936.b0d07aa894"
• channels(calvertvl): ""
• nixpkgs: /home/calvertvl/repos/nixpkgs