texlive.combined.basic-scheme: fix $PATH of wrapped scripts (#177826)

Fix missing sed, grep and coreutils in $PATH. Closes: #150620

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

···
       echo -n "Wrapping '$link'"
       rm "$link"
       makeWrapper "$target" "$link" \
-        --prefix PATH : "$out/bin:${perl}/bin" \
+        --prefix PATH : "${gnused}/bin:${gnugrep}/bin:${coreutils}/bin:$out/bin:${perl}/bin" \
         --prefix PERL5LIB : "$PERL5LIB" \
         --set-default TEXMFCNF "$TEXMFCNF"
 

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

···
 */
 { stdenv, lib, fetchurl, runCommand, writeText, buildEnv
 , callPackage, ghostscriptX, harfbuzz
-, makeWrapper, python3, ruby, perl
+, makeWrapper, python3, ruby, perl, gnused, gnugrep, coreutils
 , useFixedHashes ? true
 , recurseIntoAttrs
 }:
···
   # function for creating a working environment from a set of TL packages
   combine = import ./combine.nix {
     inherit bin combinePkgs buildEnv lib makeWrapper writeText
-      stdenv python3 ruby perl;
+      stdenv python3 ruby perl gnused gnugrep coreutils;
     ghostscript = ghostscriptX; # could be without X, probably, but we use X above
   };