[MacPorts] #52205: CMake PortGroup: set compiler explicitly

[MacPorts]

#52205: CMake PortGroup: set compiler explicitly
--------------------------+-------------------------
  Reporter:  rjvbertin@…  |      Owner:  michaelld@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  cmake        |
--------------------------+-------------------------

Comment (by larryv@…):

 Might as well just set them unconditionally. I don’t think `configure.cc`
 and `configure.cxx` should ever be empty.
 {{{
 configure.args-append -DCMAKE_C_COMPILER="${configure.cc}" \
                       -DCMAKE_CXX_COMPILER="${configure.cxx}"
 }}}

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Ticket URL: <https://trac.macports.org/ticket/52205#comment:2>
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