pgsql: Version stamp 9.0alpha4

Log Message:
-----------
Version stamp 9.0alpha4

Modified Files:
--------------
    pgsql:
        configure (r1.671 -> r1.672)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure?r1=1.671&r2=1.672)
        configure.in (r1.623 -> r1.624)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.623&r2=1.624)
    pgsql/doc:
        bug.template (r1.58 -> r1.59)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/bug.template?r1=1.58&r2=1.59)
    pgsql/src/include:
        pg_config.h.win32 (r1.68 -> r1.69)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/pg_config.h.win32?r1=1.68&r2=1.69)