pgsql: Separate the key word list that lived in keywords.c into a new

Log Message:
-----------
Separate the key word list that lived in keywords.c into a new header file
kwlist.h, to avoid having to link the backend object file into other programs
like pg_dump. We can now simply symlink a single source file from the backend
(kwlookup.c, containing the shared routine ScanKeywordLookup) and compile it
locally, which is a lot cleaner.

Modified Files:
--------------
pgsql/src/backend/parser:
Makefile (r1.48 -> r1.49)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/Makefile?r1=1.48&r2=1.49)
gram.y (r2.659 -> r2.660)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y?r1=2.659&r2=2.660)
keywords.c (r1.210 -> r1.211)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/keywords.c?r1=1.210&r2=1.211)
pgsql/src/bin/pg_dump:
Makefile (r1.66 -> r1.67)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/Makefile?r1=1.66&r2=1.67)
pgsql/src/bin/psql:
Makefile (r1.61 -> r1.62)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/Makefile?r1=1.61&r2=1.62)
pgsql/src/bin/scripts:
Makefile (r1.40 -> r1.41)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/scripts/Makefile?r1=1.40&r2=1.41)
pgsql/src/interfaces/ecpg/preproc:
Makefile (r1.141 -> r1.142)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/Makefile?r1=1.141&r2=1.142)

Added Files:
-----------
pgsql/src/backend/parser:
kwlookup.c (r2.1)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/kwlookup.c?rev=2.1&content-type=text/x-cvsweb-markup)
pgsql/src/bin/pg_dump:
keywords.c (r1.1)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/keywords.c?rev=1.1&content-type=text/x-cvsweb-markup)
pgsql/src/include/parser:
kwlist.h (r1.1)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/parser/kwlist.h?rev=1.1&content-type=text/x-cvsweb-markup)
pgsql/src/interfaces/ecpg/preproc:
keywords.c (r1.87)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/keywords.c?rev=1.87&content-type=text/x-cvsweb-markup)