textsearch-ja - eudc: Fix a bug in conversion from SJIS to UTF8 with a

Log Message:
-----------
Fix a bug in conversion from SJIS to UTF8 with a fallback character.
Improve makefile to use pgxs without USE_PGXS=1 unless the directory
is placed in PGSRC/contrib.

Modified Files:
--------------
eudc:
Makefile (r1.3 -> r1.4)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/eudc/Makefile?r1=1.3&r2=1.4)
utf8_and_sjis_eudc.c (r1.3 -> r1.4)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/eudc/utf8_and_sjis_eudc.c?r1=1.3&r2=1.4)
eudc/expected:
fallback.out (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/eudc/expected/fallback.out?r1=1.1&r2=1.2)