[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
 Keywords:               |       Port:  pg-cmake-1.1
-------------------------+--------------------------
 Presently, portgroup `cmake-1.1` is hard-coded to assume the use of macOS
 `make`, for Make-type builds. However, that precludes the use of `gmake`.

 Add a formal override, allowing ports to specify the value for `build.cmd`
 for that case.

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