texlive.withPackages: convert tlDeps packages to attribute sets

For backward compatibility, if tlDeps contains old style packages
(of the type { pkgs = [ ... ]; }), convert them to the new attribute
sets.

pkgs/tools/typesetting/tex/texlive/build-tex-env.nix

@@ -58,7 +58,7 @@ let
         keySet = p: {
           key = ((p.name or "${p.pname}-${p.version}") + "-" + p.tlOutputName or p.outputName or "");
           inherit p;
-          tlDeps = p.tlDeps or (p.requiredTeXPackages or (_: [ ]) [ ]);
+          tlDeps = if p ? tlDeps then ensurePkgSets p.tlDeps else (p.requiredTeXPackages or (_: [ ]) [ ]);
         };
       in
       # texlive.combine: the wrapper already resolves all dependencies