bug#10131: [patch] add $expt alias

[Christian Persch]

Hi;

commit 6fc4d0124d633d1b3ddc5af82967f23bd17556f8
Author: Andy Wingo <wi...@pobox.com>
Date:   Thu Sep 3 12:19:39 2009 +0200

That commit removed $expt completely without even adding a deprecated
alias (like commit ad79736c68a803a59814fbfc0cb4b092c2b4cddf did for the
other $foo functions). This removal caused a bug in aisleriot
[https://bugzilla.gnome.org/show_bug.cgi?id=649730] which was quite
hard to track down without a deprecation warning; so the attached patch
adds a deprecated alias that does warn.

Regards,
        Christian

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