[MacPorts] #13366: libiconv universal support without deactivating any previous version

[MacPorts]

#13366: libiconv universal support without deactivating any previous version
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  Reporter:  nox at macports.org  |       Owner:  ryandesign at macports.org
      Type:  enhancement       |      Status:  new                    
  Priority:  Normal            |   Milestone:  Port Enhancements      
 Component:  ports             |     Version:                         
Resolution:                    |    Keywords:                         
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Comment (by ryandesign at macports.org):

 Thank you, Anthony; I've been hoping to look into this problem (and
 several other messes in this portfile).

 Out of curiosity, why change `post-patch` to `pre-patch` for the
 `disable_utf8mac` variant? Is that material to this change?

 Also, why declare empty `configure.cppflags` and `configure.ldflags`?

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Ticket URL: <https://trac.macosforge.org/projects/macports/ticket/13366#comment:2>
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