Add native Windows binary for bison.

bison/src/bison/2.4.1/bison-2.4.1-src/build-aux/cross-options.pl

+#! /usr/bin/env perl
+
+use warnings;
+use 5.005;
+use strict;
+
+my %option;
+while (<>)
+{
+    if (/^\s*          # Initial spaces.
+        (?:(-\w),\s+)? # $1: Possible short option.
+        (--[-\w]+)     # $2: Long option.
+        (\[?)          # $3: '[' iff the argument is optional.
+        (?:=([-\w]+))? # $4: Possible argument name.
+        /x)
+    {
+        my ($short, $long, $opt, $arg) = ($1, $2, $3, $4);
+        $short = defined $short ? '@option{' . $short . '}' : '';
+        if ($arg)
+        {
+            $arg =~ s/^=//;
+            $arg = '@var{' . lc ($arg) . '}';
+            $arg = '[' . $arg . ']'
+                if $opt eq '[';
+            $option{"$long=$arg"} = $short ? "$short $arg" : '';
+        }
+        else
+        {
+            $option{"$long"} = "$short";
+        }
+    }
+}
+
+foreach my $long (sort keys %option)
+{
+    printf "\@item %-40s \@tab %s\n", '@option{' . $long . '}', $option{$long};
+}