Generate rem2pdf/bin/rem2pdf so we can embed VERSION

rem2pdf/bin/rem2pdf.in

@@ -1,4 +1,4 @@
-#!/bin/env perl
+#!@PERL@
 use strict;
 use warnings;
 
@@ -7,6 +7,8 @@ use Cairo;
 use Pango;
 use Getopt::Long;
 
+my $VERSION = '@VERSION@';
+
 use Remind::PDF;
 
 my $media_to_size = {
@@ -62,7 +64,7 @@ $me =~ s/^.*\///;
 sub usage
 {
         print <<"EOF";
-$me: Convert Remind -pp output to a PDF calendar.
+$me (version $VERSION): Convert Remind -pp output to a PDF calendar.
 
 Usage: remind -pp [options] filename | $me [options] > out.pdf