[MacPorts] #54151: qjackctl @0.45+qt4: variant +qt4 fails to build on Sierra

[MacPorts]

#54151: qjackctl @0.45+qt4: variant +qt4 fails to build on Sierra
---------------------+----------------------
 Reporter:  detlevd  |      Owner:
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.4.1
 Keywords:           |       Port:  qjackctl
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 The qt4 variant fails to build on my Sierra (10.12.4, XCode 8.3.2) system.
 Building fails due to a weird architecture option, the main.log says:
 {{{
 :info:build clang: error: invalid arch name '-arch -Xarch_x86_64'
 }}}
 (full main.log attached) I can't discover where that excess `-arch` sneaks
 in. It is in the linker call of clang++. The compile calls have {{{...
 -arch x86_64 -Xarch_x86_64 -mmacosx-version-min=10.12 ...}}} which works
 fine, but the final linker call has {{{... -arch x86_64 -arch
 -Xarch_x86_64 -mmacosx-version-min=10.12 ....}}} Strange.

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Ticket URL: <https://trac.macports.org/ticket/54151>
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