[MacPorts] #42517: asciidoc: missing dependency on libxml2

[MacPorts]

#42517: asciidoc: missing dependency on libxml2
---------------------+----------------------
 Reporter:  mojca@…  |      Owner:  cal@…
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  asciidoc
---------------------+----------------------
 I needed `asciidoc` as a build dependency, but the build failed because
 `a2x` seems to call `xmllint` from `libxml2`.

 I believe that the proper solution would be to add `libxml2` as a runtime
 dependency of `asciidoc`, but better suggestions are welcome.

 See https://build.macports.org/builders/buildports-lion-
 x86_64/builds/18327.

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Ticket URL: <https://trac.macports.org/ticket/42517>
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