[MacPorts] #56521: gcc8 @8-20170604_2: update to 8.1

[MacPorts]

#56521: gcc8 @8-20170604_2: update to 8.1
-----------------------+--------------------
  Reporter:  iqgrande  |      Owner:  (none)
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.4.4
Resolution:            |   Keywords:
      Port:  gcc8      |
-----------------------+--------------------

Comment (by kencu):

 It looks like a great majority of them could be replaced by one wrapper
 script that uses `xcrun` with the name of the tool reinplaced into it,
 should we decide to do that...
 {{{
 $ xcrun -f as
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as
 $ xcrun -f strings
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/strings
 $ xcrun -f lipo
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/lipo
 $ xcrun -f libtool
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool
 $ xcrun -f ranlib
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib
 $ xcrun -f strip
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/strip
 $ xcrun -f ar
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar
 $ xcrun -f otool
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/otool
 $ xcrun -f seg_hack
 /opt/local/bin/seg_hack
 $ xcrun -f nm
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/nm
 $ xcrun -f nm-classic
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
 /nm-classic
 $ xcrun -f segedit
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/segedit
 $ xcrun -f size
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/size
 $
 }}}

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Ticket URL: <https://trac.macports.org/ticket/56521#comment:16>
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