[MacPorts] #39811: gromacs: create a subport for gromacs-double

[MacPorts]

#39811: gromacs: create a subport for gromacs-double
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 Reporter:  mojca@…      |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  gromacs
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 I started working on #39383 and took the first port on the list: gromacs
 and gromacs-double. I'm adding the x11 option now, but the two ports need
 to be repimplemented as suports and I need some review before committing
 the final change.

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Ticket URL: <https://trac.macports.org/ticket/39811>
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