[Bug 243547] sysutils/metalog: guard non-standard fflush_unlocked definition behind #ifndef

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243547

            Bug ID: 243547
           Summary: sysutils/metalog: guard non-standard fflush_unlocked
                    definition behind #ifndef
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: kevans at freebsd.org

Created attachment 210990
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=210990&action=edit
svn(1) diff against the ports tree

A future change to FreeBSD's libc will provide this, so no need to use the
locked variant. Preemptively fix the build so it works for both old/new by
detecting whether fflush_unlocked is already defined or not.

The patch will still be needed for DragonflyBSD compatibility, but the
__FreeBSD__ part of this can be removed later once all supported versions
provide fflush_unlocked.

No PORTREVISION bump because this change is a nop until the libc implementation
is committed.

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