[Bug 288476] nix: fix 2.20.2 build by disabling markdown support

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288476

            Bug ID: 288476
           Summary: nix: fix 2.20.2 build by disabling markdown support
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ashish@FreeBSD.org
          Reporter: jon@jh86.org
          Assignee: ashish@FreeBSD.org
             Flags: maintainer-feedback?(ashish@FreeBSD.org)

Created attachment 262467
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=262467&action=edit
disable markdown support patch

When building sysutils/nix from ports, it fails with:

src/libcmd/markdown.cc:21:10: error: field designator 'cols' does not refer to
any field in type 'struct lowdown_opts'
   21 |         .cols = (size_t) std::max(windowWidth - 5, 60),
      |         ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/libcmd/markdown.cc:22:10: error: field designator 'hmargin' does not refer
to any field in type 'struct lowdown_opts'
   22 |         .hmargin = 0,
      |         ~^~~~~~~~~~~
src/libcmd/markdown.cc:23:10: error: field designator 'vmargin' does not refer
to any field in type 'struct lowdown_opts'
   23 |         .vmargin = 0,
      |         ~^~~~~~~~~~~

The markdown feature of Nix is not explicitly necessary and can be disabled
with a configure flag. I've attached a patch which fixes the build.

When this feature is disabled, Nix simply prints out docs in a raw format,
without any processing. I'd like to get the port updated, but this might be
helpful to have in the mean time. Hopefully the port does not to be removed
since it is now fixed.

Thank you!

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