[MacPorts] #19229: update gromacs to 4.0.4

[MacPorts]

#19229: update gromacs to 4.0.4
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 Reporter:  andrew@…              |       Owner:  macports-tickets@…                   
     Type:  defect                |      Status:  new                                  
 Priority:  Normal                |   Milestone:  Port Updates                         
Component:  ports                 |     Version:  1.7.1                                
 Keywords:                        |        Port:  gromacs                              
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 Trivial version bump from 4.0.0 to 4.0.4

 Incorporates changes from Ticket [http://trac.macports.org/ticket/17416
 17416]

 Note that Ticket [http://trac.macports.org/ticket/17416 17416], the
 version bump from 4.0.0 to 4.0.2, has been waiting for four months... :-)

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Ticket URL: <http://trac.macports.org/ticket/19229>
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