[MacPorts] #38518: update molmol to support gcc48 variant

[MacPorts]

#38518: update molmol to support gcc48 variant
------------------------+---------------------------------
  Reporter:  howarth@…  |      Owner:  larryv@…
      Type:  update     |     Status:  closed
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.1.3
Resolution:  fixed      |   Keywords:  haspatch maintainer
      Port:  molmol     |
------------------------+---------------------------------

Comment (by larryv@…):

 The buildbots all choked.

 * https://build.macports.org/builders/buildports-snowleopard-
 x86_64/builds/16021/steps/compile/logs/stdio
 * https://build.macports.org/builders/buildports-lion-
 x86_64/builds/9528/steps/compile/logs/stdio
 * https://build.macports.org/builders/buildports-mtln-
 x86_64/builds/3370/steps/compile/logs/stdio

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Ticket URL: <https://trac.macports.org/ticket/38518#comment:3>
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