pgsql: Second try at fsyncing directories in CREATE DATABASE.

Log Message:
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Second try at fsyncing directories in CREATE DATABASE. Let's see what the build farm says of opening directories read-only and ignoring EBADF from fsync of directories

Modified Files:
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pgsql/src/port:
copydir.c (r1.33 -> r1.34)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/port/copydir.c?r1=1.33&r2=1.34)