[MacPorts] #55705: Add +llvm60 to cctools and ld64

[MacPorts]

#55705: Add +llvm60 to cctools and ld64
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  Reporter:  gaming-hacker  |      Owner:  jeremyhu
      Type:  enhancement    |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.4.2
Resolution:                 |   Keywords:
      Port:  cctools,ld64   |
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Comment (by vit9696):

 With all the effort needed to continuously update cctools dependencies,
 may it be reasonable to provide an option to use Xcode cctools, just like
 it was done for ld64? I do not think there is a particular need in custom
 cctools on recent versions of macOS, and such a way would ease upgrading
 the custom clang compiler infrastructure with macports. @jeremyhu, what's
 your opinion?

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Ticket URL: <https://trac.macports.org/ticket/55705#comment:11>
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