[Bug 198728] [editors/vim] Setting g:is_posix=1 as default because BSD shell has certain POSIX syntax in /bin/sh

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198728

            Bug ID: 198728
           Summary: [editors/vim] Setting g:is_posix=1 as default because
                    BSD shell has certain POSIX syntax in /bin/sh
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet at FreeBSD.org
          Reporter: yuri at rawbw.com
             Flags: maintainer-feedback?(sunpoet at FreeBSD.org)
          Assignee: sunpoet at FreeBSD.org

The attached patch corrects the problem when valid syntax like this:
> val=$((some_variable - 1))
> val=$(some_function_or_command)
> val=$(${SOME_VAR} arg1 arg2)
is marked as red in syntax highlighter, because $() is the POSIX feature, and
vim needs this enabled. Since BSD runs such shell, it makes sense to enable it
by default.

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