quartus-prime-lite: add /lib/ld-lsb*.so.3 dynamic loaders to FHS env

(In preparation for adding lmutil.)

Quartus is a mix of 32- and 64-bit programs, and these "lsb" loaders are
required by some of the unwrapped binaries:

  $ find /nix/store/HASH-quartus-prime-lite-unwrapped-20.1.1.720 -type f -executable | xargs -n1 patchelf --print-interpreter |& grep "ld-lsb" | sort -u
  /lib64/ld-lsb-x86-64.so.3
  /lib/ld-lsb.so.3

pkgs/applications/editors/quartus-prime/default.nix

@@ -17,6 +17,11 @@ in buildFHSEnvChroot rec {
   name = "quartus-prime-lite"; # wrapped
 
   targetPkgs = pkgs: with pkgs; [
+    (runCommand "ld-lsb-compat" {} ''
+      mkdir -p "$out/lib"
+      ln -sr "${glibc}/lib/ld-linux-x86-64.so.2" "$out/lib/ld-lsb-x86-64.so.3"
+      ln -sr "${pkgsi686Linux.glibc}/lib/ld-linux.so.2" "$out/lib/ld-lsb.so.3"
+    '')
     # quartus requirements
     glib
     xorg.libICE