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