llvmPackages_{11,12,13,14}: remove stdenv override

This doesn't seem required anymore. (Present in NixOS x86_64 via i686
compat libs with things like wine/steam)

pkgs/top-level/all-packages.nix

@@ -14727,35 +14727,27 @@ with pkgs;
     buildLlvmTools = buildPackages.llvmPackages_11.tools;
     targetLlvmLibraries = targetPackages.llvmPackages_11.libraries or llvmPackages_11.libraries;
     targetLlvm = targetPackages.llvmPackages_11.llvm or llvmPackages_11.llvm;
-  } // lib.optionalAttrs (stdenv.hostPlatform.isi686 && stdenv.hostPlatform == stdenv.buildPlatform && buildPackages.stdenv.cc.isGNU) {
-    stdenv = gcc7Stdenv;
   }));
 
   llvmPackages_12 = recurseIntoAttrs (callPackage ../development/compilers/llvm/12 ({
     inherit (stdenvAdapters) overrideCC;
     buildLlvmTools = buildPackages.llvmPackages_12.tools;
     targetLlvmLibraries = targetPackages.llvmPackages_12.libraries or llvmPackages_12.libraries;
     targetLlvm = targetPackages.llvmPackages_12.llvm or llvmPackages_12.llvm;
-  } // lib.optionalAttrs (stdenv.hostPlatform.isi686 && stdenv.hostPlatform == stdenv.buildPlatform && buildPackages.stdenv.cc.isGNU) {
-    stdenv = gcc7Stdenv;
   }));
 
   llvmPackages_13 = recurseIntoAttrs (callPackage ../development/compilers/llvm/13 ({
     inherit (stdenvAdapters) overrideCC;
     buildLlvmTools = buildPackages.llvmPackages_13.tools;
     targetLlvmLibraries = targetPackages.llvmPackages_13.libraries or llvmPackages_13.libraries;
     targetLlvm = targetPackages.llvmPackages_13.llvm or llvmPackages_13.llvm;
-  } // lib.optionalAttrs (stdenv.hostPlatform.isi686 && stdenv.hostPlatform == stdenv.buildPlatform && buildPackages.stdenv.cc.isGNU) {
-    stdenv = gcc7Stdenv;
   }));
 
   llvmPackages_14 = recurseIntoAttrs (callPackage ../development/compilers/llvm/14 ({
     inherit (stdenvAdapters) overrideCC;
     buildLlvmTools = buildPackages.llvmPackages_14.tools;
     targetLlvmLibraries = targetPackages.llvmPackages_14.libraries or llvmPackages_14.libraries;
     targetLlvm = targetPackages.llvmPackages_14.llvm or llvmPackages_14.llvm;
-  } // lib.optionalAttrs (stdenv.hostPlatform.isi686 && stdenv.hostPlatform == stdenv.buildPlatform && buildPackages.stdenv.cc.isGNU) {
-    stdenv = gcc7Stdenv;
   }));
 
   llvmPackages_latest = llvmPackages_14;