rust.envVars: use wrapped LLD for aarch64 musl

The unwrapped version doesn't know where to look for libraries, so
this is required to e.g. build anything that uses openssl-sys with
OPENSSL_NO_VENDOR. A randomly chosen example package that's fixed by
this change is pkgsStatic.gitoxide.

pkgs/build-support/rust/lib/default.nix

···
 { lib
 , stdenv
 , pkgsBuildHost
+, pkgsBuildTarget
 , pkgsTargetTarget
 }:
 
···
     cxxForHost = "${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++";
     linkerForHost = if shouldUseLLD stdenv.targetPlatform
       && !stdenv.cc.bintools.isLLVM
-      then "${pkgsBuildHost.lld}/bin/ld.lld"
+      then "${pkgsBuildHost.llvmPackages.bintools}/bin/${stdenv.cc.targetPrefix}ld.lld"
       else ccForHost;
 
     # Unfortunately we must use the dangerous `pkgsTargetTarget` here
···
     cxxForTarget = "${pkgsTargetTarget.stdenv.cc}/bin/${pkgsTargetTarget.stdenv.cc.targetPrefix}c++";
     linkerForTarget = if shouldUseLLD pkgsTargetTarget.stdenv.targetPlatform
       && !pkgsTargetTarget.stdenv.cc.bintools.isLLVM # whether stdenv's linker is lld already
-      then "${pkgsBuildHost.lld}/bin/ld.lld"
+      then "${pkgsBuildTarget.llvmPackages.bintools}/bin/${pkgsTargetTarget.stdenv.cc.targetPrefix}ld.lld"
       else ccForTarget;
 
     rustBuildPlatform = stdenv.buildPlatform.rust.rustcTarget;

pkgs/development/compilers/rust/1_75.nix

···
   rustcPatches = [ ];
 }
 
-(builtins.removeAttrs args [ "pkgsBuildTarget" "llvmPackages_17" "llvm_17"])
+(builtins.removeAttrs args [ "llvmPackages_17" "llvm_17"])

pkgs/development/compilers/rust/default.nix

···
 , CoreFoundation, Security, SystemConfiguration
 , pkgsBuildBuild
 , pkgsBuildHost
+, pkgsBuildTarget
 , pkgsTargetTarget
 , makeRustPlatform
 , wrapRustcWith
···
 
 let
   # Use `import` to make sure no packages sneak in here.
-  lib' = import ../../../build-support/rust/lib { inherit lib stdenv pkgsBuildHost pkgsTargetTarget; };
+  lib' = import ../../../build-support/rust/lib {
+    inherit lib stdenv pkgsBuildHost pkgsBuildTarget pkgsTargetTarget;
+  };
   # Allow faster cross compiler generation by reusing Build artifacts
   fastCross = (stdenv.buildPlatform == stdenv.hostPlatform) && (stdenv.hostPlatform != stdenv.targetPlatform);
 in