textsearch-ja - textsearch-ja: Use PGXS automatically even if USE_PGXS

Log Message:
-----------
Use PGXS automatically even if USE_PGXS is not specified
unless the source tree is built under $PGSRC/contrib.

Modified Files:
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textsearch-ja:
Makefile (r1.6 -> r1.7)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch-ja/Makefile?r1=1.6&r2=1.7)