xz: run autoreconfHook on OpenBSD

This cannot be made unconditional as it causes infinite recursion, but
the old libtool being used messes up the distribution of OpenBSD shared
libraries.

pkgs/tools/compression/xz/default.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchurl,
+  autoreconfHook,
   enableStatic ? stdenv.hostPlatform.isStatic,
   writeScript,
   testers,
@@ -37,6 +38,10 @@ stdenv.mkDerivation (finalAttrs: {
   enableParallelBuilding = true;
   doCheck = true;
 
+  nativeBuildInputs = lib.optionals stdenv.hostPlatform.isOpenBSD [
+    autoreconfHook
+  ];
+
   # this could be accomplished by updateAutotoolsGnuConfigScriptsHook, but that causes infinite recursion
   # necessary for FreeBSD code path in configure
   postPatch = ''