[MacPorts] #29446: spidermonkey: update to 1.8.5

[MacPorts]

#29446: spidermonkey: update to 1.8.5
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  Reporter:  ryandesign@…  |      Owner:  akitada@…
      Type:  update        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:  haspatch
      Port:  spidermonkey  |
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Comment (by nicholas@…):

 Had to remove `--enable-threadsafe` from the configure args to build
 successfully on ppc64.

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Ticket URL: <https://trac.macports.org/ticket/29446#comment:9>
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