[MacPorts] #64009: pg cmake-1.1: add option to formally override build.cmd, for Make-type builds

[MacPorts]

#64009: pg cmake-1.1: add option to formally override build.cmd, for Make-type
builds
---------------------------+----------------------
  Reporter:  mascguy       |      Owner:  mascguy
      Type:  enhancement   |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:
      Port:  pg-cmake-1.1  |
---------------------------+----------------------

Comment (by RJVB):

 I just tested an idea. The CMake 1.1 PG sets `build.cmd` in the callback
 for `cmake.generator`. IOW, you set the generator, `build.cmd` is set to
 the PG's default ... and you can then override that setting at liberty. In
 my quick test this also works when you do not set `cmake.generator` but
 only `build.cmd`. A priori that is because the generator callback isn't
 called for the default `cmake.generator` setting.

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Ticket URL: <https://trac.macports.org/ticket/64009#comment:7>
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