Don't go into dotted directories when copying Makefile.in to Makefile

Reviewed-by: NRich Salz <rsalz@openssl.org>

Configure

@@ -1297,23 +1297,30 @@ foreach my $alg ( 'bn' ) {
 # Copy all Makefile.in to Makefile (except top-level)
 use File::Find;
 use IO::File;
-find(sub {
-        return if ($_ ne "Makefile.in" || $File::Find::dir eq ".");
-        my $in = IO::File->new($_, "r") or
-            die sprintf "Error reading Makefile.in in %s: !$\n",
+find(
+    {
+        preprocess => sub {
+            grep(!/^\./, @_);
+        },
+        wanted => sub {
+            return if ($_ ne "Makefile.in" || $File::Find::dir eq ".");
+            my $in = IO::File->new($_, "r") or
+                die sprintf "Error reading Makefile.in in %s: !$\n",
                 $File::Find::dir;
-        my $out = IO::File->new("Makefile", "w") or
-            die sprintf "Error writing Makefile in %s: !$\n",
+            my $out = IO::File->new("Makefile", "w") or
+                die sprintf "Error writing Makefile in %s: !$\n",
                 $File::Find::dir;
-        print $out "# Generated from $_, do not edit\n";
-        while (my $line = <$in>) { print $out $line }
-        $in->close() or
-            die sprintf "Error reading Makefile.in in %s: !$\n",
+            print $out "# Generated from $_, do not edit\n";
+            while (my $line = <$in>) { print $out $line }
+            $in->close() or
+                die sprintf "Error reading Makefile.in in %s: !$\n",
                 $File::Find::dir;
-        $out->close() or
-            die sprintf "Error writing Makefile in %s: !$\n",
+            $out->close() or
+                die sprintf "Error writing Makefile in %s: !$\n",
                 $File::Find::dir;
-    }, ".");
+        },
+    },
+    ".");
 
 my %builders = (
     unixmake => sub {