apr: update libtool, fix downstream aprutil on aarch64-darwin

pkgs/development/libraries/apr/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl }:
+{ lib, stdenv, fetchurl, autoreconfHook }:
 
 stdenv.mkDerivation rec {
   name = "apr-1.7.0";
@@ -36,6 +36,10 @@ stdenv.mkDerivation rec {
 
   CPPFLAGS=lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-DAPR_IOVEC_DEFINED";
 
+  nativeBuildInputs =
+    # Update libtool for macOS 11 support
+    lib.optional (stdenv.isDarwin && stdenv.isAarch64) [ autoreconfHook ];
+
   enableParallelBuilding = true;
 
   meta = with lib; {