autoconf213: move 'm4' and 'perl' to nativeBuildInputs (strictDeps = true)

Without the change `strictDeps = true` build fails as:

    $ nix build --impure --expr 'with import ./. {}; autoconf213.overrideAttrs (oa: { strictDeps = true;})'
    Error: Autoconf requires GNU m4 1.1 or later

pkgs/development/tools/misc/autoconf/2.13.nix

@@ -9,7 +9,8 @@ stdenv.mkDerivation rec {
     sha256 = "07krzl4czczdsgzrrw9fiqx35xcf32naf751khg821g5pqv12qgh";
   };
 
-  buildInputs = [ m4 perl ];
+  nativeBuildInputs = [ m4 perl ];
+  strictDeps = true;
 
   doCheck = true;