[MacPorts] #58460: ccache, ccache-devel: allow installation without asciidoc

[MacPorts]

#58460: ccache, ccache-devel: allow installation without asciidoc
-----------------------------------+------------------------
  Reporter:  Russell-Jones-OxPhys  |      Owner:  ryandesign
      Type:  enhancement           |     Status:  closed
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:
Resolution:  fixed                 |   Keywords:
      Port:  ccache, ccache-devel  |
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Comment (by ryandesign):

 As of version 4.0 ccache has switched to the cmake build system and no
 longer includes a pre-generated ccache manpage so now we do need asciidoc
 again to generate it.

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Ticket URL: <https://trac.macports.org/ticket/58460#comment:12>
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