Thread: pgsql-server: Suppress psql \s help display for platforms like Win32

Log Message:
-----------
Suppress psql \s help display for platforms like Win32 that don't
typically install witn readline, and throw an error if they try to
access it.

Modified Files:
--------------
    pgsql-server/doc/src/sgml/ref:
        psql-ref.sgml (r1.122 -> r1.123)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/psql-ref.sgml.diff?r1=1.122&r2=1.123)
    pgsql-server/src/bin/psql:
        help.c (r1.93 -> r1.94)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/bin/psql/help.c.diff?r1=1.93&r2=1.94)
        input.c (r1.38 -> r1.39)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/bin/psql/input.c.diff?r1=1.38&r2=1.39)