[MacPorts] #47579: cmake portgroup: an option to specify non-default location of CMakeLists.txt

[MacPorts]

#47579: cmake portgroup: an option to specify non-default location of
CMakeLists.txt
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 Reporter:  mojca@…      |      Owner:  larryv@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:
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 I came across a port (submission) where `CMakeLists.txt` is not in the top
 dir (#38921). As a consequence one must introduce a fix like this one:
 {{{
 configure.post_args ${worksrcpath}/build
 }}}
 (or change a bunch of other variables to achieve the same goal).

 While I consider this to be some kind of a "bug", it would be nice if we
 had some explicit setting rather than having to overwrite
 `configure.post_args` (even though both would currently achieve the same).

 Now that you have already introduced a new option (r134128) like
    * `cmake.build_dir`
 would it perhaps make sense to add also `cmake.<someother>_dir` to denote
 the directory where `CMakeLists.txt` is located in case it's not default?

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Ticket URL: <https://trac.macports.org/ticket/47579>
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