[perl-gnome2-canvas/deprecation] Makefile.PL: added deprecation notice

[Brian Manning <bmanning src gnome org>]

commit 380a23ec1495428b421abd6aa7ac7bfd4e9e70bd
Author: Brian Manning <bmanning src gnome org>
Date:   Thu Oct 1 21:33:23 2020 -0700

    Makefile.PL: added deprecation notice

 Makefile.PL | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
---
diff --git a/Makefile.PL b/Makefile.PL
index d9911fc..27c2df9 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -90,6 +90,33 @@ WriteMakefile(
     $gnomecanvas->get_makefile_vars,
 );
 
+print <<__EON__;
+NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE
+
+This module has been deprecated by the Gtk-Perl project.  This means that the
+module will no longer be updated with security patches, bug fixes, or when
+changes are made in the Perl ABI.  The Git repo for this module has been
+archived (made read-only), it will no longer possible to submit new commits to
+it.  You are more than welcome to ask about this module on the Gtk-Perl
+mailing list, but our priorities going forward will be maintaining Gtk-Perl
+modules that are supported and maintained upstream; this module is neither.
+
+Since this module is licensed under the LGPL v2, you may also fork this
+module, if you wish, but you will need to use a different name for it on CPAN,
+and the Gtk-Perl team requests that you use your own resources (mailing list,
+Git repos, bug trackers, etc.) to maintain your fork going forward.
+
+* Perl URL: https://gitlab.gnome.org/GNOME/perl-gnome2-canvas
+* Upstream URL: https://gitlab.gnome.org/Archive/libgnomecanvas
+* Last upstream version: 2.30.3
+* Last upstream release date: 2011-01-31
+* Migration path for this module: Cairo
+* Migration module URL: https://metacpan.org/pod/Cairo
+
+
+NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE
+
+__EON__
 
 sub MY::postamble {
        return Glib::MakeHelper->postamble_clean ()