[MacPorts] #28638: p5-css fix for permissions error

[MacPorts]

#28638: p5-css fix for permissions error
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 Reporter:  pixilla@…             |       Owner:  macports-tickets@…                   
     Type:  defect                |      Status:  new                                  
 Priority:  Normal                |   Milestone:                                       
Component:  ports                 |     Version:  1.9.2                                
 Keywords:  haspatch              |        Port:  p5-css                               
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 The p5-css Portfile uses system to execute a perl script at files/build-
 grammer.pl to recompile a file.[[BR]]
 It looks like the script wants to output to `pwd` and I get permission
 errors on my system.[[BR]]
 This patch simply cd's to ${worksrcpath} before calling the perl script
 and my errors go away and file file gets recompiled.

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Ticket URL: <https://trac.macports.org/ticket/28638>
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