[MacPorts] #34171: root: add cling variant

[MacPorts]

#34171: root: add cling variant
--------------------------------------+-------------------------------------
 Reporter:  Deil.Christoph@…          |       Owner:  mattiafrancescomoro@…        
     Type:  enhancement               |      Status:  new                          
 Priority:  Normal                    |   Milestone:                               
Component:  ports                     |     Version:  2.0.4                        
 Keywords:                            |        Port:  root                         
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Comment(by jonesc@…):

 The ROOT configure script supports the possibility that the gcc compiler
 binary names might be custom (as they are for MacPorts) with the options

 {{{
              --with-cc=${configure.cc} \
              --with-cxx=${configure.cxx} \
              --with-ld=${configure.cxx} \
              --with-f77=${configure.f77}
 }}}

 The MacPorts clang and llvm binaries will have custom names, with mp in
 them, so if the ROOT devs decide not to provide a similar possibility
 here, there is not much we can do about it....

 Chris

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Ticket URL: <https://trac.macports.org/ticket/34171#comment:4>
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