[MacPorts] #39663: mosml, mosml-dynlibs: fix whitespace

[MacPorts]

#39663: mosml, mosml-dynlibs: fix whitespace
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 Reporter:  ryandesign@…  |      Owner:  cso@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.1.3
 Keywords:                |       Port:  mosml, mosml-dynlibs
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 The indentation of the mosml and mosml-dynlibs portfiles do not conform to
 standard MacPorts style, that is to say indentations are not at multiples
 of 4 spaces. Also, the mosml port needs the standard modeline added. (It's
 already in mosml-dynlibs.)

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Ticket URL: <https://trac.macports.org/ticket/39663>
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