variable eval and expansion in variant descriptions

[Darren Weber]

The following example doesn't expand the variable in the results to 'port
variants <portname>'


set exDataPath ${prefix}/share/${distname}/data

variant data description {install example data [default: ${exDataPath}]} {
    ....
}

It would be nice if a user can find this installation information using
'port variants <portname>'.  I suppose 'port contents <portname>' is another
option.

Regards, Darren
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