[MacPorts] #60128: golang portgroup 1.0: add support for -ldflags

[MacPorts]

#60128: golang portgroup 1.0: add support for -ldflags
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  Reporter:  emcrisostomo  |      Owner:  (none)
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:                |
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Comment (by emcrisostomo):

 I just merged an update on another port ({{{devel/dep}}}) whose build
 script generates a very similar {{{ldflags}}} string and may benefit from
 the same changes in the {{{golang}}} portgroup.

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Ticket URL: <https://trac.macports.org/ticket/60128#comment:2>
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