[MacPorts] #40397: Update gpg-agent to version 2.0.21

[MacPorts]

#40397: Update gpg-agent to version 2.0.21
------------------------+--------------------------------
 Reporter:  feranick@…  |      Owner:  macports-tickets@…
     Type:  update      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.2.0
 Keywords:              |       Port:  gpg-agent
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 GPG is now available in version 2.0.21 upstream (http://www.gnupg.org/).
 gpg-agent is still in version 2.0.19 and should be updated accordingly.

 Changelogs:
 v. 2.0.21: http://lists.gnupg.org/pipermail/gnupg-
 announce/2013q3/000332.html
 v. 20.020: http://lists.gnupg.org/pipermail/gnupg-
 announce/2013q2/000328.html

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Ticket URL: <https://trac.macports.org/ticket/40397>
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