[MacPorts] #52699: cmake portgroup version 1.1

[MacPorts]

#52699: cmake portgroup version 1.1
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  Reporter:  mkae         |      Owner:  mkae
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  cmake        |
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Comment (by RJVB):

 Yeah, well, we usually aim for fixes, not workarounds, no? :)

 As I said, it's easy enough to introduce such an option, in a way that
 nothing changes for most ports.

 I remembered there was a project of making out-of-source builds the
 default, so I applied that too.

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Ticket URL: <https://trac.macports.org/ticket/52699#comment:7>
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