pgsql: Make sure contrib C functions are marked strict where needed.

Log Message:
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Make sure contrib C functions are marked strict where needed.
Kris Jurka

Modified Files:
--------------
pgsql/contrib/chkpass:
chkpass.c (r1.12 -> r1.13)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/chkpass/chkpass.c.diff?r1=1.12&r2=1.13)
chkpass.sql.in (r1.5 -> r1.6)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/chkpass/chkpass.sql.in.diff?r1=1.5&r2=1.6)
pgsql/contrib/isbn_issn:
isbn_issn.sql.in (r1.10 -> r1.11)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/isbn_issn/isbn_issn.sql.in.diff?r1=1.10&r2=1.11)
pgsql/contrib/lo:
lo.sql.in (r1.11 -> r1.12)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/lo/lo.sql.in.diff?r1=1.11&r2=1.12)
pgsql/contrib/miscutil:
misc_utils.c (r1.19 -> r1.20)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/miscutil/misc_utils.c.diff?r1=1.19&r2=1.20)
misc_utils.sql.in (r1.7 -> r1.8)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/miscutil/misc_utils.sql.in.diff?r1=1.7&r2=1.8)
pgsql/contrib/userlock:
user_locks.sql.in (r1.4 -> r1.5)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/userlock/user_locks.sql.in.diff?r1=1.4&r2=1.5)