pgsql: Temporarily disable fsyncing the database directory in CREATE

Log Message:
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Temporarily disable fsyncing the database directory in CREATE DATABASE
until we can work out portability issues the build farm uncovered.

In passing avoid fsyncing subdirectories twice.

Modified Files:
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    pgsql/src/port:
        copydir.c (r1.27 -> r1.28)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/port/copydir.c?r1=1.27&r2=1.28)