gcc13: drop already upstreamed mingwW64 patch

[trofi]

Without the change the patch failed to apply as:

$ nix build -f. pkgsCross.mingwW64.stdenv.cc.cc
...
x86_64-w64-mingw32-stage-final-gcc> applying patch /nix/store/sb9irfs83qvdgkf23agvv1vn96n9z31p-Added-mcf-thread-model-support-from-mcfgthread.patch
x86_64-w64-mingw32-stage-final-gcc> patching file config/gthr.m4
x86_64-w64-mingw32-stage-final-gcc> Reversed (or previously applied) patch detected!  Assume -R? [n]
x86_64-w64-mingw32-stage-final-gcc> Apply anyway? [n]
x86_64-w64-mingw32-stage-final-gcc> Skipping patch.
...

The patch is apready present in gcc-13.1.0.

Description of changes

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• 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/)
• 23.05 Release Notes (or backporting 22.11 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.

[trofi]

Might require more fixes to provide the libc:

./gthr-default.h:34:10: fatal error: mcfgthread/gthr.h: No such file or directory
   34 | #include <mcfgthread/gthr.h>
      |          ^~~~~~~~~~~~~~~~~~~

[trofi]

It needs an mcfgtreads update (has to happen in a lockstep with default gcc. I'll merge this patch as is as it does not make things worse.