[MacPorts] #62789: openmpi: remove subports for clang 3.3 and 3.4

[MacPorts]

#62789: openmpi: remove subports for clang 3.3 and 3.4
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  Reporter:  mascguy  |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  openmpi  |
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Comment (by mascguy):

 As a quick follow-up: While we should continue supporting a wide range of
 compiler versions, the sheer number of combinations we provide is almost
 overwhelming.

 If we can remove a few of the oldest compilers, that would help a bit with
 maintaining this port.

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Ticket URL: <https://trac.macports.org/ticket/62789#comment:1>
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