Remove cups-pdf-filter

It has been obsoleted by the cups-filters package.

pkgs/misc/cups/pdf-filter.nix

@@ -1,39 +0,0 @@
-{ stdenv, fetchurl, pkgconfig, cups, poppler }:
-
-stdenv.mkDerivation {
-  name = "cups-pdf-filter-${cups.version}";
-
-  inherit (cups) src;
-
-  buildInputs = [ pkgconfig cups poppler ];
-
-  preConfigure = ''
-    sed -e 's@\.\./cups/$(LIBCUPS)@@' -e 's@$(LIBCUPSIMAGE)@@' -i filter/Makefile
-    '';
-
-  NIX_LDFLAGS="-L${cups}/lib";
-
-  configureFlags = ''
-    --localstatedir=/var --enable-dbus
-    --enable-image --with-pdftops=pdftops'';
-
-  buildPhase = ''
-    cd filter
-    make pdftops
-    '';
-
-  installPhase = ''
-    mkdir -pv $out/lib/cups/filter $out/share/cups/mime
-    cp -v pdftops $out/lib/cups/filter
-    echo >$out/share/cups/mime/pdftops.convs 'application/pdf application/vnd.cups-postscript 66 pdftops'
-    '';
-
-
-  meta = {
-    homepage = http://www.cups.org/;
-    description = "Image and pdf filters for CUPS";
-    license = "GPLv2";
-    maintainers = [ stdenv.lib.maintainers.urkud ];
-    platforms = stdenv.lib.platforms.linux;
-  };
-}

pkgs/top-level/all-packages.nix

@@ -8663,8 +8663,6 @@ let
 
   cups = callPackage ../misc/cups { };
 
-  cups_pdf_filter = callPackage ../misc/cups/pdf-filter.nix { };
-
   gutenprint = callPackage ../misc/drivers/gutenprint { };
 
   gutenprintBin = callPackage ../misc/drivers/gutenprint/bin.nix { };