pgsql: Update Snowball.

Log Message:
-----------
Update Snowball. I have to update it because of
old version doesn't available on Snowball's site and new version
of stemmers can't be compiled with old interface.

Tags:
----
REL8_0_STABLE

Modified Files:
--------------
pgsql/contrib/tsearch2:
dict_snowball.c (r1.3.8.1 -> r1.3.8.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/dict_snowball.c.diff?r1=1.3.8.1&r2=1.3.8.2)
pgsql/contrib/tsearch2/gendict:
README.gendict (r1.1 -> r1.1.8.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/gendict/README.gendict.diff?r1=1.1&r2=1.1.8.1)
config.sh (r1.1 -> r1.1.8.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/gendict/config.sh.diff?r1=1.1&r2=1.1.8.1)
pgsql/contrib/tsearch2/snowball:
api.c (r1.5 -> r1.5.4.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/snowball/api.c.diff?r1=1.5&r2=1.5.4.1)
api.h (r1.3 -> r1.3.8.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/snowball/api.h.diff?r1=1.3&r2=1.3.8.1)
english_stem.c (r1.4 -> r1.4.8.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/snowball/english_stem.c.diff?r1=1.4&r2=1.4.8.1)
english_stem.h (r1.2 -> r1.2.8.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/snowball/english_stem.h.diff?r1=1.2&r2=1.2.8.1)
header.h (r1.3 -> r1.3.8.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/snowball/header.h.diff?r1=1.3&r2=1.3.8.1)
russian_stem.c (r1.3 -> r1.3.8.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/snowball/russian_stem.c.diff?r1=1.3&r2=1.3.8.1)
russian_stem.h (r1.2 -> r1.2.8.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/snowball/russian_stem.h.diff?r1=1.2&r2=1.2.8.1)
utilities.c (r1.5 -> r1.5.4.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/snowball/utilities.c.diff?r1=1.5&r2=1.5.4.1)