pgsql: Use DEVTTY as 'con' on Win32 as a replacement for /dev/tty.

Log Message:
-----------
Use DEVTTY as 'con' on Win32 as a replacement for /dev/tty.

Modified Files:
--------------
pgsql/src/bin/psql:
command.c (r1.162 -> r1.163)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/command.c.diff?r1=1.162&r2=1.163)
pgsql/src/include:
port.h (r1.87 -> r1.88)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/port.h.diff?r1=1.87&r2=1.88)
pgsql/src/port:
sprompt.c (r1.13 -> r1.14)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/port/sprompt.c.diff?r1=1.13&r2=1.14)