ports/136940: [MAINTAINER] textproc/asciidoc: use realpath instead of GNU readlink

[Peter Schuller]

Turns out there are multiple references to readlink -f. The attached
updated patch should be complete.

Also, although this is unrelated to readlink, more patching was needed
because it depends on a GNU:ish getopt. The attached patch:

(1) Replaces all readlinke -f references.
(2) Makes a2x use /usr/local/bin/getopt.
(3) Adds misc/getopt as a run dependency.

Please commit that instead of the original patch.

-- 
/ Peter Schuller

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