[MacPorts] #37466: py-dulwich: update to 0.8.7

[MacPorts]

#37466: py-dulwich: update to 0.8.7
----------------------------+--------------------------------
 Reporter:  macports.org@…  |      Owner:  macports-tickets@…
     Type:  update          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.1.2
 Keywords:                  |       Port:  py-dulwich
----------------------------+--------------------------------
 0.8.6 and 0.8.7 were released on 2012-11-09 and 2012-11-27, the current
 hg-git [https://bitbucket.org/durin42/hg-git/issue/62/pull-crashes-on-
 some-repos fails on some repositories] (found so far:
 [https://github.com/mitsuhiko/flask/ Flask],
 [https://github.com/jquery/jquery jQuery],
 [https://github.com/ivaynberg/select2 select2],
 [https://github.com/ErshKUS/OpenStreetMap.ru OpenStreetMap.ru]); according
 to the bug report a more recent version of dulwich should fix the issue.

 Fix confirmed by uninstalling the port and installing dulwich 2.7 directly
 (via pip): all 4 repositories are clonable.

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Ticket URL: <https://trac.macports.org/ticket/37466>
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