stdenv: fix custom hardening settings when using `__structuredAttrs = true;`

Replaces / Closes #353131

A while ago `postgresql` switched to using structured attrs[1]. In the
PR it was reported that this made postgresql notably slower when
importing SQL dumps[2].

After a bit of debugging it turned out that the hardening was entirely
missing and the following combination of settings was the culprit:

    hardeningEnable = [ "pie" ];
    __structuredAttrs = true;

I.e. the combination of custom hardening settings and structured attrs.

What happened here is that internally the default and enabled hardening
flags get written into `NIX_HARDENING_ENABLE`. However, the value is a list
and the setting is not in the `env` section. This means that in the
structured-attrs case we get something like

    declare -ax NIX_HARDENING_ENABLE=([0]="bindnow" [1]="format" [2]="fortify" [3]="fortify3" [4]="pic" [5]="relro" [6]="stackprotector" [7]="strictoverflow" [8]="zerocallusedregs" [9]="pie")

i.e. an actual array rather than a string with all hardening flags being
space-separated which is what the hardening code of the cc-wrapper
expects[3].

This only happens if `hardeningEnable` or `hardeningDisable` are
explicitly set by a derivation: if none of those are set,
`NIX_HARDENING_ENABLE` won't be set by `stdenv.mkDerivation` and the
default hardening flags are configured by the setup hook of the
cc-wrapper[4].

In other words, this _only_ applies to derivations that have both custom
hardening settings _and_ `__structuredAttrs = true;`.

All values of `NIX_HARDENING_ENABLE` are well-known, so we don't have to
worry about escaping issues. Just forcing it to a string by
concatenating the list everytime solves the issue without additional
issues like eval errors when inheriting `env` from a structuredAttrs
derivation[5]. The price we're paying is a full rebuild.

[1] https://github.com/NixOS/nixpkgs/pull/294504
[2] https://github.com/NixOS/nixpkgs/pull/294504#issuecomment-2451482522
[3] https://github.com/NixOS/nixpkgs/blob/cf3e5d3744dc26c3498aa5dadfa0e078c632cede/pkgs/build-support/cc-wrapper/add-hardening.sh#L9
[4] https://github.com/NixOS/nixpkgs/blob/cf3e5d3744dc26c3498aa5dadfa0e078c632cede/pkgs/build-support/cc-wrapper/setup-hook.sh#L114
[5] https://github.com/NixOS/nixpkgs/pull/353131/commits/1e84a7fb95ba8770aca373efd95d1dc87ceef432

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