[MacPorts] #59515: [icu] : support building with llvm-ar

[MacPorts]

#59515: [icu] : support building with llvm-ar
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  Reporter:  RJVB         |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  icu          |
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Comment (by RJVB):

 No, why? This is indeed the modified version of the mh-config patch that I
 intended to attach.

 If you feel like tinkering with this, add the PortGroup below to the
 portfile and build with `+LTO`
 https://github.com/RJVB/macstrop/blob/master/_resources/port1.0/group/LTO-1.0.tcl

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Ticket URL: <https://trac.macports.org/ticket/59515#comment:2>
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