solana-cli: get libc++ headers on Darwin from stdenv.cc.libcxx

pkgs/by-name/so/solana-cli/package.nix

@@ -6,7 +6,6 @@
   darwin,
   udev,
   protobuf,
-  libcxx,
   rocksdb_8_3,
   installShellFiles,
   pkg-config,
@@ -99,7 +98,6 @@ rustPlatform.buildRustPackage rec {
     ]
     ++ lib.optionals stdenv.hostPlatform.isLinux [ udev ]
     ++ lib.optionals stdenv.hostPlatform.isDarwin [
-      libcxx
       IOKit
       Security
       AppKit
@@ -133,8 +131,8 @@ rustPlatform.buildRustPackage rec {
 
   # Require this on darwin otherwise the compiler starts rambling about missing
   # cmath functions
-  CPPFLAGS = lib.optionals stdenv.hostPlatform.isDarwin "-isystem ${lib.getDev libcxx}/include/c++/v1";
-  LDFLAGS = lib.optionals stdenv.hostPlatform.isDarwin "-L${lib.getLib libcxx}/lib";
+  CPPFLAGS = lib.optionals stdenv.hostPlatform.isDarwin "-isystem ${lib.getInclude stdenv.cc.libcxx}/include/c++/v1";
+  LDFLAGS = lib.optionals stdenv.hostPlatform.isDarwin "-L${lib.getLib stdenv.cc.libcxx}/lib";
 
   # If set, always finds OpenSSL in the system, even if the vendored feature is enabled.
   OPENSSL_NO_VENDOR = 1;