Merge pull request #231835 from divanorama/bitcoin_darwin_fix

bitcoin: fix copmilation on x86_64-darwin

pkgs/top-level/all-packages.nix

···
   balanceofsatoshis = nodePackages.balanceofsatoshis;
 
   bitcoin  = libsForQt5.callPackage ../applications/blockchains/bitcoin {
+    stdenv = if stdenv.isDarwin then darwin.apple_sdk_11_0.stdenv else stdenv;
     boost = boost17x;
     withGui = true;
     inherit (darwin) autoSignDarwinBinariesHook;