attempt a quick fix for broken epdfinfo in pdf-tools for nix-provided emacs

default.nix

# ref https://www.reddit.com/r/NixOS/comments/6dvm04/how_to_install_emacs_pdftools_with_epdfinfo/di5yii9/
# git clone https://github.com/politza/pdf-tools
# run this from within
# then M-x package-install-file
# select the .tar from the `make` output; the epdfinfo is broken.
# then cp the patchelf-ed version into emacs

with (import <nixpkgs> {});
 
 stdenv.mkDerivation {
   name = "pdf-tools";
 
   buildInputs = [
     stdenv
     cask
     pkgconfig
     autoconf
     automake
 
     libpng
     zlib
     poppler
     poppler_gi     
   ];
   shellHook = ''
     make
     patchelf \
       --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
       server/epdfinfo
   '';
 }