Revert "Merge pull request #137479 from r-ryantm/auto-update/libsigcxx"
Revert "Merge pull request #137479 from r-ryantm/auto-update/libsigcxx"

This reverts commit 74a8798eb1fb08acd938aaf698b482930668a402, reversing
changes made to 3d192af34046b060a0ff2715461e5c68d87d79ae.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs