pgbulkload - pgbulkload: Fix USE_PGXS=1 build on 8.3 or earlier

Log Message:
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Fix USE_PGXS=1 build on 8.3 or earlier versions.
(per Mitsuru HASEGAWA)

Tags:
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VERSION_2_4_0

Modified Files:
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pgbulkload/lib:
Makefile (r1.4 -> r1.4.2.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbulkload/pgbulkload/lib/Makefile?r1=1.4&r2=1.4.2.1)

Added Files:
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pgbulkload:
COPYRIGHT (r1.1.2.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbulkload/pgbulkload/COPYRIGHT?rev=1.1.2.2&content-type=text/x-cvsweb-markup)
pgbulkload/lib/nbtree:
COPYRIGHT.nbtsort (r1.1.2.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbulkload/pgbulkload/lib/nbtree/COPYRIGHT.nbtsort?rev=1.1.2.2&content-type=text/x-cvsweb-markup)