pg_upgrade never used Windows junction points but instead always used
Windows hard links.
Reported-by: Adrian Klaver
Discussion: https://postgr.es/m/
6a638c60-90bb-4921-8ee4-
5fdad68f8b09@aklaver.com
Backpatch-through: 9.3, where the mention first appeared
<term><option>-k</option></term>
<term><option>--link</option></term>
<listitem><para>use hard links instead of copying files to the new
- cluster (use junction points on Windows)</para></listitem>
+ cluster</para></listitem>
</varlistentry>
<varlistentry>