[MacPorts] #35456: update gromacs and gromacs-double to gcc46

[MacPorts]

#35456: update gromacs and gromacs-double to gcc46
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 Reporter:  bcbarnes@…          |       Owner:  macports-tickets@…                   
     Type:  update              |      Status:  new                                  
 Priority:  Normal              |   Milestone:                                       
Component:  ports               |     Version:  2.1.2                                
 Keywords:  gromacs, gcc46      |        Port:  gromacs                              
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 The ports gromacs and gromacs-double have gcc45 as a library dependency.
 gcc46 is available and gromacs compiles fine with it.  Could we get the
 gromacs ports updated to gcc46 as a variant to avoid the gcc45 library
 dependency / compile-time requirement?

 thanks!

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Ticket URL: <https://trac.macports.org/ticket/35456>
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