flatbuffers: 2.0.0 -> 2.0.6

- Looks like the tests need access to files in the '<srcdir>/tests'
  directory, so this path needs to be patched now. (Apparently upstream
  uses 'cmake .', and something broke between the versions for out of
  source builds.)

- Python is needed to generate tests, according to CMake output.

- Disable generation of universal binaries on Darwin.

pkgs/development/libraries/flatbuffers/default.nix

@@ -3,33 +3,30 @@
 , fetchFromGitHub
 , fetchpatch
 , cmake
+, python3
 }:
 
 stdenv.mkDerivation rec {
   pname = "flatbuffers";
-  version = "2.0.0";
+  version = "2.0.6";
 
   src = fetchFromGitHub {
     owner = "google";
     repo = "flatbuffers";
     rev = "v${version}";
-    sha256 = "1zbf6bdpps8369r1ql00irxrp58jnalycc8jcapb8iqg654vlfz8";
+    sha256 = "sha256-0bJ0n/5yzj6lHXLKJzHUS0Bnlmys+X7pY/3LGapVh6k=";
   };
 
-  patches = [
-    # Pull patch pending upstream inclustion for gcc-12 support:
-    # https://github.com/google/flatbuffers/pull/6946
-    (fetchpatch {
-      name = "gcc-12.patch";
-      url = "https://github.com/google/flatbuffers/commit/17d9f0c4cf47a9575b4f43a2ac33eb35ba7f9e3e.patch";
-      sha256 = "0sksk47hi7camja9ppnjr88jfdgj0nxqxy8976qs1nx73zkgbpf9";
-    })
-  ];
+  nativeBuildInputs = [ cmake python3 ];
 
-  nativeBuildInputs = [ cmake ];
+  postPatch = ''
+    # Fix default value of "test_data_path" to make tests work
+    substituteInPlace tests/test.cpp --replace '"tests/";' '"../tests/";'
+  '';
 
   cmakeFlags = [
     "-DFLATBUFFERS_BUILD_TESTS=${if doCheck then "ON" else "OFF"}"
+    "-DFLATBUFFERS_OSX_BUILD_UNIVERSAL=OFF"
   ];
 
   doCheck = stdenv.hostPlatform == stdenv.buildPlatform;