taler-wallet-core: correct broken condition

[Aleksanaa]

Correct #407039

Using .config instead of lib.system.equals because it's config passed here that matters, not others (like gcc.arch)

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[FliegendeWurst]

The previous condition lines up with the configurePlatforms definition. (Which directly influences the --build / --host flags)

nixpkgs/pkgs/stdenv/generic/make-derivation.nix

Lines 282 to 287 in 7154e12

	configurePlatforms ?
	optionals (stdenv.hostPlatform != stdenv.buildPlatform || config.configurePlatformsByDefault)
	[
	"build"
	"host"
	],

[Aleksanaa]

The previous condition lines up with the configurePlatforms definition. (Which directly influences the --build / --host flags)

Okay, that is probably wrong too. See #278001 and #380005.

You can just put it here as we have to solve much more than this, and it doesn't help here in the short term.