[MacPorts] #23093: update gromacs to 4.0.7

[MacPorts]

#23093: update gromacs to 4.0.7
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 Reporter:  adfernandes@…             |       Owner:  adfernandes@…           
     Type:  update                    |      Status:  new                     
 Priority:  Normal                    |   Milestone:                          
Component:  ports                     |     Version:  1.8.1                   
 Keywords:  gromacs-double            |        Port:  gromacs                 
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 Almost trivial update to gromacs.

 No patchfiles now needed.

 Universal building now supported via `muniversal` portgroup. Auto
 detection of 64-bit builds.

 Also updating `gromacs-double`

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Ticket URL: <http://trac.macports.org/ticket/23093>
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