pgbouncer - pgbouncer: Mark hash.c as public domain because Jenkins

Log Message:
-----------
Mark hash.c as public domain because Jenkins original code is

Modified Files:
--------------
pgbouncer/src:
hash.c (r1.7 -> r1.8)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/hash.c.diff?r1=1.7&r2=1.8)
pgbouncer/include:
hash.h (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/include/hash.h.diff?r1=1.2&r2=1.3)