[MacPorts] #36492: git-core @1.7.12.2 +subtree : add a variant to support git-subtree

[MacPorts]

#36492: git-core @1.7.12.2 +subtree : add a variant to support git-subtree
-------------------------+--------------------------------
 Reporter:  kngspook@…   |      Owner:  macports-tickets@…
     Type:  update       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.1.2
 Keywords:  git-subtree  |       Port:  git-core
-------------------------+--------------------------------
 git-subtree has been merged into mainline git as of 1.7.11, but only in
 the contrib/ tree. This is to add a variant to optionally install git-
 subtree, much like how we do for contrib/credential/osxkeychain.

 Patch attached.

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Ticket URL: <https://trac.macports.org/ticket/36492>
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