gnutls: Fix failing patch when cross compiling to Arm32

[matthewmazzanti]

Motivation for this change

A patch for tests that fail on arm has been upstreamed, and is no longer needed.

Things done

Remove the patch

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[vcunat]

The patch wasn't failing (I first thought you meant that) but perhaps it isn't needed anymore. The cross-compilation I tried works both before and after this PR.

--arg crossSystem '(import ./lib).systems.examples.armv7l-hf-multiplatform'

[vcunat]

With gnutls 3.7.1 the patch no longer applied and was removed in #119590