Thread: pgsql: Remove contrib/spi/preprocessor, which has been uninteresting

Log Message:
-----------
Remove contrib/spi/preprocessor, which has been uninteresting ever
since we supported standard FOREIGN KEY constraint syntax.  It was
harmless enough just sitting there, but the prospect of having to
document it is surely more work than it's worth.

Removed Files:
-------------
    pgsql/contrib/spi/preprocessor:
        README.MAX
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/spi/preprocessor/README.MAX)
        example.sql
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/spi/preprocessor/example.sql)
        step1.c
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/spi/preprocessor/step1.c)
        step2.pl
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/spi/preprocessor/step2.pl)