zig: 0.1.1 -> 0.2.0

(cherry picked from commit dc3b791854589d7c1c6d210f070a1e82315798f6)

pkgs/development/compilers/zig/default.nix

···
-{ stdenv, fetchFromGitHub, cmake, llvmPackages }:
+{ stdenv, fetchFromGitHub, cmake, llvmPackages, libxml2 }:
 
 stdenv.mkDerivation rec {
-  version = "0.1.1";
+  version = "0.2.0";
   name = "zig-${version}";
 
   src = fetchFromGitHub {
     owner = "zig-lang";
     repo = "zig";
     rev = "${version}";
-    sha256 = "01yqjyi25f99bfmxxwyh45k7j84z0zg7n9jl8gg0draf96mzdh06";
+    sha256 = "0lym28z9mj6hfiq78x1fsd8y89h8xyfc1jgqyazi1g9r72427n07";
   };
 
-  buildInputs = [ cmake llvmPackages.clang-unwrapped llvmPackages.llvm ];
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ llvmPackages.clang-unwrapped llvmPackages.llvm libxml2 ];
 
   cmakeFlags = [
     "-DZIG_LIBC_INCLUDE_DIR=${stdenv.cc.libc_dev}/include"
···
 
   meta = with stdenv.lib; {
     description = "Programming languaged designed for robustness, optimality, and clarity";
-    homepage = http://ziglang.org/;
+    homepage = https://ziglang.org/;
     license = licenses.mit;
     platforms = platforms.unix;
     maintainers = [ maintainers.andrewrk ];

pkgs/top-level/all-packages.nix

···
     czmq = czmq3;
   };
 
-  zig = callPackage ../development/compilers/zig {};
+  zig = callPackage ../development/compilers/zig {
+    llvmPackages = llvmPackages_6;
+  };
 
   zimlib = callPackage ../development/libraries/zimlib { };