[Bug 231361] weechat failing to load ruby.so after recent updates

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231361

            Bug ID: 231361
           Summary: weechat failing to load ruby.so after recent updates
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: twasson at gmail.com

I recently restarted weechat for the first time in awhile (1-2 months), and now
it can't load ruby.so because of:

Error: unable to load plugin "/usr/local/lib/weechat/plugins/ruby.so"
/usr/local/lib/weechat/plugins/ruby.so: Undefined symbol "ruby_version"

`strings /usr/local/lib/weechat/plugins/ruby.so` reveals that ruby_version is
in the file.  I first saw this with the binary pkg installation, but I've
rebuilt weechat from source from the ports tree and that didn't resolve the
problem.  I also updated to 11.2-RELEASE after I first saw this, which also had
no effect, incidentally.  ktrace revealed nothing useful, and I'm not sure what
I should look for with dtrace.

`nm -D /usr/local/lib/weechat/plugins/ruby.so`, however, reveals that the
symbol is present but undefined.  I tried editing linker flags in the cmake
script but couldn't figure out how to make clang disable undefined symbols.

I mailed freebsd-ports about this and received a confirmation of this issue on
CURRENT with weechat 2.2 and ruby 2.4.4 from Kubilay Kocak.

I suspect this is more likely to be a FreeBSD-specific problem than a general
weechat problem, as I see no reports (other than a random pastebin paste) of
this anywhere online.

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