texlive: add ghostscript when containing pdfcrop

Potential disadvantage: ghostscript will become visible to user,
so there may e.g. be (new) collisions in nix-env due to this.
Fixes #28411.

pkgs/tools/typesetting/tex/texlive/combine.nix

@@ -15,7 +15,10 @@ let
   pkgList = rec {
     all = lib.filter pkgFilter (combinePkgs pkgSet);
     splitBin = lib.partition (p: p.tlType == "bin") all;
-    bin = mkUniquePkgs splitBin.right;
+    bin = mkUniquePkgs splitBin.right
+      ++ lib.optional
+          (lib.any (p: p.tlType == "run" && p.pname == "pdfcrop") splitBin.wrong)
+          (lib.getBin ghostscript);
     nonbin = mkUniquePkgs splitBin.wrong;
 
     # extra interpreters needed for shebangs, based on 2015 schemes "medium" and "tetex"

pkgs/tools/typesetting/tex/texlive/default.nix

@@ -30,6 +30,7 @@ let
     inherit bin combinePkgs buildEnv fastUnique lib makeWrapper writeText
       stdenv python ruby;
     perl = perl522; # avoid issues like #26890, probably remove after texlive upgrade
+    ghostscript = ghostscriptX; # could be without X, probably, but we use X above
   };
 
   # the set of TeX Live packages, collections, and schemes; using upstream naming