[MacPorts] #48188: grib_api: append to depends_build rather than overwriting

[MacPorts]

#48188: grib_api: append to depends_build rather than overwriting
--------------------------+-----------------------
 Reporter:  ryandesign@…  |      Owner:  takeshi@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.99
 Keywords:  haspatch      |       Port:  grib_api
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 grib_api sets depends_build and includes port:cmake in it. But the port
 also includes the cmake portgroup which already sets that dependency for
 you. All you need to do to take advantage of that is append to
 depends_build rather than overwriting it.

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Ticket URL: <https://trac.macports.org/ticket/48188>
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