pgbouncer - pgbouncer: system.h + types cleanup - use proper printf

Log Message:
-----------
system.h + types cleanup

- use proper printf args from inttypes.h instead of casting to ull
- remove unused macros
- tag replacement functions as _mustcheck

Modified Files:
--------------
    pgbouncer/include:
        system.h (r1.8 -> r1.9)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/include/system.h.diff?r1=1.8&r2=1.9)
    pgbouncer/src:
        pktbuf.c (r1.5 -> r1.6)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/pktbuf.c.diff?r1=1.5&r2=1.6)
        stats.c (r1.7 -> r1.8)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/stats.c.diff?r1=1.7&r2=1.8)