pgsql: Add openjade warning -wfully-tagged to warn about missing close

Log Message:
-----------
Add openjade warning -wfully-tagged to warn about missing close tags on
older SGML toolchains.

Modified Files:
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pgsql/doc/src/sgml:
Makefile (r1.97 -> r1.98)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/Makefile?r1=1.97&r2=1.98)