[MacPorts] #54104: gcc6 and libgcc fail to build on Tiger i386 due to -ldylib1.10 not found. Fixes to repair.

[MacPorts]

#54104: gcc6 and libgcc fail to build on Tiger i386 due to -ldylib1.10 not found.
Fixes to repair.
--------------------------+-------------------
  Reporter:  kencu        |      Owner:
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  tiger
      Port:  gcc6 libgcc  |
--------------------------+-------------------
Changes (by kencu):

 * Attachment "Portfile" added.

 working gcc6 / libgcc Portfile for Tiger i386

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Ticket URL: <https://trac.macports.org/ticket/54104>
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