Motivation for this change

This is small rebuild targeting staging to fix small breakage introduced in #29396.

1. makeSetupHook: make the default name "hook" overridable for occasional convenience while looking at drv paths, such as in the output of nix-build and nix-diff.
2. ld-is-cc-hook: init
   This hook sets LD to CC, for use with software that works as if LD=$CC when LD is unset, and does not work when LD=ld.
3. perlPackages: use ld-is-cc-hook to fix build after Bintools Wrapper: Init by refactoring out of cc-wrapper, take 2 #29396 removed -L path/to/dir/of/libstdc++.so from ld flags. See Bintools Wrapper: Init by refactoring out of cc-wrapper, take 2 #29396 (comment)
   Module::Build build helper works correctly when LD is unset (taking LD from Perl config to be cc). However, we can not unset LD because this goes contrary to the cross compilation effort, and we can not make it propagate ld-is-cc-hook because it breaks e.g. the build of libguestfs. However, Bintools Wrapper: Init by refactoring out of cc-wrapper, take 2 #29396 makes LD=ld incompatible with just 3 perl packages; they are individually fixed by this commit.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.