boost159: fix build on aarch64-darwin

pkgs/development/libraries/boost/1.59.nix

···
-{ callPackage, fetchurl, ... } @ args:
+{ callPackage, fetchurl, fetchpatch, ... } @ args:
 
 callPackage ./generic.nix (args // rec {
   version = "1.59.0";
+
+  boostBuildPatches = [
+    # Fixes a segfault on aarch64-darwin from an implicitly defined varargs function.
+    # https://github.com/boostorg/build/pull/238
+    (fetchpatch {
+      url = "https://github.com/boostorg/build/commit/48e9017139dd94446633480661e5447c7e0d8b1b.diff";
+      excludes = [
+        # Doesn't apply, isn't critical.
+        "src/engine/filesys.h"
+      ];
+      sha256 = "sha256-/HLOJKBcGqcK9yBYKSRCSMmTNhCH3sSpK1s3OzkIqx8";
+    })
+  ];
 
   src = fetchurl {
     url = "mirror://sourceforge/boost/boost_${builtins.replaceStrings ["."] ["_"] version}.tar.bz2";

pkgs/development/libraries/boost/generic.nix

···
 , enableNumpy ? false
 , taggedLayout ? ((enableRelease && enableDebug) || (enableSingleThreaded && enableMultiThreaded) || (enableShared && enableStatic))
 , patches ? []
+, boostBuildPatches ? []
 , useMpi ? false
 , mpi
 , extraB2Args ? []
···
       stdenv.hostPlatform.isMips64n32 ||
       # the patch above does not apply cleanly to pre-1.65 boost
       (stdenv.hostPlatform.isMips64n64 && (versionOlder version "1.65"));
+  };
+
+  passthru = {
+    inherit boostBuildPatches;
   };
 
   preConfigure = optionalString useMpi ''

pkgs/development/tools/boost-build/default.nix

···
     sourceRoot="$sourceRoot/tools/build"
   '';
 
+  patches = useBoost.boostBuildPatches or [];
+
   # Upstream defaults to gcc on darwin, but we use clang.
   postPatch = ''
     substituteInPlace src/build-system.jam \