Revert "flatpak: do not use autoreconfHook"

This reverts commit a7e4dba1e9.

Apparently, tarballs do not ship autogen.sh 😿

pkgs/development/libraries/flatpak/default.nix

@@ -1,8 +1,6 @@
 { stdenv
 , fetchurl
-, autoconf
-, automake
-, libtool
+, autoreconfHook
 , docbook_xml_dtd_412
 , docbook_xml_dtd_42
 , docbook_xml_dtd_43
@@ -106,9 +104,7 @@ stdenv.mkDerivation rec {
   ];
 
   nativeBuildInputs = [
-    autoconf
-    automake
-    libtool
+    autoreconfHook
     libxml2
     docbook_xml_dtd_412
     docbook_xml_dtd_42
@@ -183,10 +179,6 @@ stdenv.mkDerivation rec {
     patchShebangs tests
   '';
 
-  preConfigure = ''
-    NOCONFIGURE=1 ./autogen.sh
-  '';
-
   passthru = {
     tests = {
       installedTests = nixosTests.installed-tests.flatpak;