Merge commit 'cfb29ab882323d379aba20a95020c7c24f883eae'

Partial staging merge, including cc-wrapper fixes

Conflicts:
	pkgs/applications/audio/spotify/default.nix
	pkgs/build-support/cc-wrapper/default.nix
	pkgs/development/compilers/cryptol/1.8.x.nix

pkgs/development/tools/build-managers/cargo/snapshot.nix

@@ -37,7 +37,7 @@ stdenv.mkDerivation {
     cp -r bin "$out/bin"
   '' + (if stdenv.isLinux then ''
     patchelf --interpreter "${stdenv.glibc}/lib/${stdenv.cc.dynamicLinker}" \
-             --set-rpath "${stdenv.cc.gcc}/lib/:${stdenv.cc.gcc}/lib64/:${zlib}/lib" \
+             --set-rpath "${stdenv.cc.cc}/lib/:${stdenv.cc.cc}/lib64/:${zlib}/lib" \
              "$out/bin/cargo"
   '' else "");
 }