[MacPorts] #55998: netcdf-fortran: Add clang variants

[MacPorts]

#55998: netcdf-fortran: Add clang variants
-------------------------+----------------------------
 Reporter:  platipodium  |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  netcdf-fortran
-------------------------+----------------------------
 netcdf-fortran does not have a clang variant.  This might seem
 unnecessary, as this is a fortran build only, but the dependent port
 `esmf` inherits variants and that one should have a `clang` variant (which
 is currently blocked).

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Ticket URL: <https://trac.macports.org/ticket/55998>
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