[MacPorts] #29707: git-core 1.7.5.3 fails to install doc if build and destroot run as separate commands

[MacPorts]

#29707: git-core 1.7.5.3 fails to install doc if build and destroot run as separate
commands
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 Reporter:  mta@…          |       Owner:  macports-tickets@…                   
     Type:  defect         |      Status:  new                                  
 Priority:  Normal         |   Milestone:                                       
Component:  base           |     Version:  1.9.99                               
 Keywords:                 |        Port:  git-core                             
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Comment(by mta@…):

 I didn't remove the code in portextract::extract_start which sets these
 variables.  It is now redundant and probably could be removed but to be
 safe I left it in.

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Ticket URL: <https://trac.macports.org/ticket/29707#comment:1>
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