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

[MacPorts]

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

 * status:  reopened => closed
 * resolution:   => fixed


Comment:

 llvm-6.0 has been in use for some time now; llvm 7, 8, and 9 are also
 active.

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Ticket URL: <https://trac.macports.org/ticket/55705#comment:19>
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