nixos/dhcpcd: allow jemalloc and mimalloc memory allocators (#346938)

  config = lib.mkIf enableDHCP {

    assertions = [ {

      # dhcpcd doesn't start properly with malloc ∉ [ libc scudo ]

      # dhcpcd doesn't start properly with malloc ∉ [ jemalloc libc mimalloc scudo ]

      # see https://github.com/NixOS/nixpkgs/issues/151696

      assertion =

        dhcpcd.enablePrivSep

          -> lib.elem config.environment.memoryAllocator.provider [ "libc" "scudo" ];

          -> lib.elem config.environment.memoryAllocator.provider [ "jemalloc" "libc" "mimalloc" "scudo" ];

      message = ''

        dhcpcd with privilege separation is incompatible with chosen system malloc.

          Currently only the `libc` and `scudo` allocators are known to work.

          Currently `graphene-hardened` allocator is known to be broken.

          To disable dhcpcd's privilege separation, overlay Nixpkgs and override dhcpcd

          to set `enablePrivSep = false`.

      '';