cargo: fix install check phase when cross

pkgs/development/compilers/rust/cargo.nix

@@ -65,7 +65,7 @@ rustPlatform.buildRustPackage.override {
   doInstallCheck = !stdenv.hostPlatform.isStatic && stdenv.hostPlatform.isElf;
   installCheckPhase = ''
     runHook preInstallCheck
-    readelf -a $out/bin/.cargo-wrapped | grep -F 'Shared library: [libcurl.so'
+    ${stdenv.cc.targetPrefix}readelf -a $out/bin/.cargo-wrapped | grep -F 'Shared library: [libcurl.so'
     runHook postInstallCheck
   '';