[MacPorts] #37796: Add scala2.10-docs subport

[MacPorts]

#37796: Add scala2.10-docs subport
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 Reporter:  msa@…        |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.1.2
 Keywords:               |       Port:  scala2.10-docs
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 Attached is a patch to the scala2.10 Portfile which adds a scala2.10-docs
 subport consisting of the standard API docs. I'm pretty new to portfile
 development, and I couldn't find any documentation on subports, so please
 review carefully for correctness. Note it was my original goal to add a
 +doc variant to the scala2.10 port, however the scala api docs are not
 available in a distfile of the same format as the scala distribution
 itself. This prevented the use of MacPorts' native distfile extraction
 capability, so the subport approach was taken instead.

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Ticket URL: <https://trac.macports.org/ticket/37796>
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