pgsql: Use SYSTEMQUOTE as concatentation to strings, rather than %s

Log Message:
-----------
Use SYSTEMQUOTE as concatentation to strings, rather than %s printf
patterns, for clarity.

Modified Files:
--------------
    pgsql/src/backend/postmaster:
        postmaster.c (r1.559 -> r1.560)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/postmaster.c?r1=1.559&r2=1.560)
    pgsql/src/bin/initdb:
        initdb.c (r1.156 -> r1.157)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/initdb/initdb.c?r1=1.156&r2=1.157)
    pgsql/src/bin/pg_ctl:
        pg_ctl.c (r1.99 -> r1.100)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_ctl/pg_ctl.c?r1=1.99&r2=1.100)
    pgsql/src/bin/pg_dump:
        pg_dumpall.c (r1.104 -> r1.105)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_dumpall.c?r1=1.104&r2=1.105)
    pgsql/src/bin/psql:
        command.c (r1.190 -> r1.191)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/command.c?r1=1.190&r2=1.191)