pgsql-server: Add _O_TEXT option to dup2 call on Windows, to ensure

Log Message:
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Add _O_TEXT option to dup2 call on Windows, to ensure redirected postmaster
stderr is in text mode. Per Andreas.

Modified Files:
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pgsql-server/src/backend/postmaster:
syslogger.c (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/postmaster/syslogger.c.diff?r1=1.2&r2=1.3)