[MacPorts] #52181: healpix-c, healpix-cxx: use branch variable

[MacPorts]

#52181: healpix-c, healpix-cxx: use branch variable
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 Reporter:  ryandesign@…  |      Owner:  aronnax@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.4
 Keywords:  haspatch      |       Port:  healpix-c, healpix-cxx
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 This patch introduces the [wiki:PortfileRecipes#branch branch] variable
 into the healpix-c and healpix-cxx ports, and uses it in the master_sites
 line, so that you don't have to update the version number in two places
 when you update the port.

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Ticket URL: <https://trac.macports.org/ticket/52181>
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