pgsql: Fix pg_ctl -D handling for Win32:

Log Message:
-----------
Fix pg_ctl -D handling for Win32:

    C:\msys\1.0\home\y-asaba>pg_ctl -D data restart
    waiting for postmaster to shut down...LOG:  received smart shutdown
    request.
    LOG:  shutting down
    LOG:  database system is shut down
    done
    postmaster stopped

    postmaster starting

    C:\msys\1.0\home\y-asaba>postmaster.exe: invalid argument: "'-D'"
    Try "postmaster.exe --help" for more information.

Yoshiyuki Asaba

Modified Files:
--------------
    pgsql/src/backend/postmaster:
        postmaster.c (r1.433 -> r1.434)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/postmaster.c.diff?r1=1.433&r2=1.434)
    pgsql/src/bin/pg_ctl:
        pg_ctl.c (r1.37 -> r1.38)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_ctl/pg_ctl.c.diff?r1=1.37&r2=1.38)