wechat-uos: fix crashing issue caused by zerocallusedregs hardening

[xddxdd]

Description of changes

The hardening flag zerocallusedregs enabled by default in #316761 caused incompatibility with WeChat's binary file. WeChat would crash in a series of pthread calls.

Overriding the glibc in the FHS with one compiled without the zerocallusedregs fixes the issue.

Immense thanks to @Cryolitia for spending a ton of compute resources and time on bisecting the issue.

Fixes #327860

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/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 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.

---

Add a 👍 reaction to pull requests you find important.

[Cryolitia]

Good work!

test on x86_64-linux

[UlyssesZh]

Thank you for this PR, and also thank @Cryolitia for finding out the cause of the problem.