[Bug 239282] devel/simgear: does not build with textproc/expat2-2.2.7

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239282

            Bug ID: 239282
           Summary: devel/simgear: does not build with
                    textproc/expat2-2.2.7
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: martymac at FreeBSD.org
          Reporter: svysh.fbsd at gmail.com
          Assignee: martymac at FreeBSD.org
             Flags: maintainer-feedback?(martymac at FreeBSD.org)

- devel/simgear fails during exp-run with a new version textproc/expat2-2.2.7
- See Bug 238864
- The reason maybe lies with the contradiction between two points:

1) simgear borrows many source files from very old versions of expat, see:
devel/simgear/work/simgear-2018.3.2/3rdparty/expat/*

2) simgear implicitly depends on the current version of textproc/expat2, see:
https://www.freebsd.org/cgi/ports.cgi?query=simgear&stype=all&sektion=all

Recently expat2 has been heavily modified, and at the moment quite a few
improvements (beyond ver 2.2.7) are under way, see:
https://github.com/libexpat/libexpat

So no wander that the old code of expat (which is explicitly included with
simgear) becomes not-compatible with the present code of expat2. More
non-compatibilities are feasible with further versions of expat2.

Maybe maintainer could contact upstream about removing of the expat2's code
from the sources of simgear, and instead introducing of explicit dependency
from expat2? If not, then we most probably need new freebsd patches for the
simgear port with each new version of expat2.

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