[MacPorts] #58539: grass7: add ZStandard compression support

[MacPorts]

#58539: grass7: add ZStandard compression support
-------------------------+--------------------
 Reporter:  nilason      |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  ZSTD         |       Port:  grass7
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 With GRASS GIS 7.6 the ZSTD compression method was added and made the
 default (if available).

 [https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures76]

 [https://grass.osgeo.org/grass76/manuals/r.compress.html]

 I would suggest to add this in form of a variant, e.g.:

 {{{
 variant zstd description {Add ZStandard compression} {
     depends_lib-append       port:zlib
     configure.args-append    --with-zstd
     configure.args-append    --with-zstd-includes=${prefix}/include
     configure.args-append    --with-zstd-libs=${prefix}/lib
 }
 }}}

 I have successfully tested this locally.

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Ticket URL: <https://trac.macports.org/ticket/58539>
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